Publications (146)
The Composite Spectrum of BOSS Quasars Selected for Studies of the Lyman-alpha Forest
David W. Harris, Trey W. Jensen, Nao Suzuki +12
The Baryon Oscillation Spectroscopic Survey (BOSS) has collected more than 150,000 quasar spectra since 2009. Using this unprecedented sample, we create a com…
Very Low Mass Stellar and Substellar Companions to Solar-like Stars From MARVELS IV: A Candidate Brown Dwarf or Low-Mass Stellar Companion to HIP 67526
Peng Jiang, Jian Ge, Phillip Cargile +50
We report the discovery of a candidate brown dwarf or a very low mass stellar companion (MARVELS-5b) to the star HIP 67526 from the Multi-object APO Radial Velocity Exoplanet Large…
An overview of sensing platform-technological aspects for vector magnetic measurement: a case study of the application in different scenarios
Huan Liu, Haobin Dong, Jian Ge +1
Magnetic sensing platform techniques have been used in many years in an attempt to better evaluate the likelihood of recoverable hydrocarbon reservoirs by determining the depth and…
The APOGEE Spectroscopic Survey of Kepler Planet Hosts: Feasibility, Efficiency, and First Results
Scott W. Fleming, Suvrath Mahadevan, Rohit Deshpande +33
The Kepler mission has yielded a large number of planet candidates from among the Kepler Objects of Interest (KOIs), but spectroscopic follow-up of these relatively faint stars is…
Gehring Link Problem, Focal Radius and Over-torical width
Jian Ge
In this note, we study the Gehring link problem in the round sphere, which motives our study of the width of a band in positively curved manifolds. Using the same idea, we are able…
KELT-3b: A Hot Jupiter Transiting a V=9.8 Late-F Star
Joshua Pepper, Robert J. Siverd, Thomas G. Beatty +31
We report the discovery of KELT-3b, a moderately inflated transiting hot Jupiter with a mass of 1.477 (-0.067, +0.066) M_J, and radius of 1.345 +/- 0.072 R_J, with an orbital perio…
A simple proof of Perelman's collapsing theorem for 3-manifolds
Jianguo Cao, Jian Ge
We will simplify earlier proofs of Perelman's collapsing theorem for 3-manifolds given by Shioya-Yamaguchi and Morgan-Tian. Among other things, we use Perelman's critical point the…
TransitNet: A Compact Attention-Augmented Deep Learning Framework for Low-SNR Transit Blind Searches
Xingchen Yan, Jian Ge, Qingtian Liu +3
Motivated by the observational incompleteness of intermediate-to-long-period Earth-size planets, we present TransitNet, a compact attention-augmented deep-learning framework for lo…
All Sky Doppler Extrasolar Planet Surveys with a Multi-object Dispersed Fixed-delay Interferometer
Jian Ge, Suvrath Mahadevan, Julian van Eyken +2
We propose to use a high throughput and high precision multi-object dispersed fixed-delay interferometer for all sky Doppler surveys for extrasolar planets. This instrument, a comb…
GTLS: A GPU-accelerated method for periodic transit detection
Quanquan Hu, Jian Ge, Luoxi Jin +1
Computational efficiency is a critical requirement for transit searches in modern large-scale photometric surveys. We present Graphics Processing Units Transit Least Squares (GTLS)…
KELT-4Ab: An inflated Hot Jupiter transiting the bright (V~10) component of a hierarchical triple
Jason D. Eastman, Thomas G. Beatty, Robert J. Siverd +42
We report the discovery of KELT-4Ab, an inflated, transiting Hot Jupiter orbiting the brightest component of a hierarchical triple stellar system. The host star is an F star with $…
An Inexpensive Field-Widened Monolithic Michelson Interferometer for Precision Radial Velocity Measurements
Suvrath Mahadevan, Jian Ge, Scott W. Fleming +4
We have constructed a thermally compensated field-widened monolithic Michelson interferometer that can be used with a medium-resolution spectrograph to measure precise Doppler radi…
Evidence of Planetesimal infall on to the very young Herbig Be star LkH234
Abhijit Chakraborty, Jian Ge, Suvrath Mahadevan
We report here the first evidence for planetesimal infall onto the very young Herbig Be star LkH234. These results are based on observations acquired over 31 days using spectr…
Dust Reddened Quasars in FIRST and UKIDSS: Beyond the Tip of the Iceberg
Eilat Glikman, Tanya Urrutia, Mark Lacy +7
We present the results of a pilot survey to find dust-reddened quasars by matching the FIRST radio catalog to the UKIDSS near-infrared survey, and using optical data from SDSS to s…
Transiting Planet Simulations from the All Sky Extrasolar Planets Survey
Stephen R. Kane, Jian Ge
Many of the planets discovered via the radial velocity technique are hot Jupiters in 3-5 day orbits with ~10$% chance of transiting their parent star. However, radial velocity surv…
Examining the relationships between colour, , and [M/H] for APOGEE K and M dwarfs
Sarah J. Schmidt, Erika L. Wagoner, Jennifer A. Johnson +4
We present the effective temperatures (), metallicities, and colours in SDSS, 2MASS, and WISE filters, of a sample of 3834 late-K and early-M dwarfs selected from the…
Quasar 2175 Ã dust absorbers I: metallicity, depletion pattern, and kinematics
Jingzhe Ma, Jian Ge, Yinan Zhao +4
We present 13 new 2175 Ã dust absorbers at z_abs = 1.0 - 2.2 towards background quasars from the Sloan Digital Sky Survey. These absorbers are examined in detail using data from th…
A WRF-UCM-SOLWEIG framework of 10m resolution to quantify the intra-day impact of urban features on thermal comfort
Xiaotian Ding, Yongling Zhao, Yifan Fan +2
City-scale outdoor thermal comfort diagnostics are essential for understanding actual heat stress. However, previous research primarily focused on the street scale. Here, we presen…
The First Extrasolar Planet Discovered with a New Generation High Throughput Doppler Instrument
Jian Ge, Julian van Eyken, Suvrath Mahadevan +17
We report the detection of the first extrasolar planet, ET-1 (HD 102195b), using the Exoplanet Tracker (ET), a new generation Doppler instrument. The planet orbits HD 102195, a you…
Riemannian Rigidity of the Parallel Postulate in Total Curvature
Jian Ge, Luis Guijarro, Pedro Solórzano
We prove that the Euclidean plane is the only Riemannian plane with total curvature and free of conjugate points that satisfies Playfair's version of the parallel postulate.
FeII and FeI emission in IRAS 07598+6508 and PHL 1092
John Kwan, Fu-zhen Cheng, Li-Zhi Fang +2
One of the puzzles in understanding the spectra of active galactic nuclei (AGN) is the origin of the FeII emission. FeI emission, if present, will help reveal the physical conditio…
Keck/ESI Long-slit Spectroscopy of SBS 1421+511: A Recoiling Quasar Nucleus in An Active Galaxy Pair?
Luming Sun, Hongyan Zhou, Lei Hao +6
We present Keck/ESI long-slit spectroscopy of SBS 1421+511, a system consisting of a quasar at z = 0.276 and an extended source 3" northern to the quasar. The quasar shows a blue-s…
Adaptive Optics Spectroscopy: Preliminary Theoretical Results
Jian Ge, Roger Angel, David Sandler +3
We have done theoretical calculations and simulations for infrared spectroscopy at the MMT 6.5 m with laser guide star AO, which provides almost full sky coverage. The results show…
Unbounded mean convex domains in Euclidean space
Jian Ge
In this note, we prove that the infimum of the mean curvature on any disconnected boundary component of an unbounded mean convex domain in must be zero.
Temperature Compensation Method of Fluxgate Sensor Based on Polynomial Fitting
Ruiping Yang, Huan Liu, Jian Ge +2
Fluxgate sensors are widely used in the field of low frequency and weak vector magnetic field measurement because of their good performance, such as high resolution and low power c…
Accurate Atmospheric Parameters at Moderate Resolution Using Spectral Indices: Preliminary Application to the MARVELS Survey
Luan Ghezzi, LetÃcia Dutra-Ferreira, Diego Lorenzo-Oliveira +17
Studies of Galactic chemical and dynamical evolution in the solar neighborhood depend on the availability of precise atmospheric parameters (Teff, [Fe/H] and log g) for solar-type…
Planetesimal Accretion in Binary Systems: Could Planets Form Around Alpha Centauri B ?
Ji-Wei Xie, Ji-Lin Zhou, Jian Ge
Stellar perturbations affect planet-formation in binary systems. Recent studies show that the planet-formation stage of mutual accretion of km-sized planetesimals is most sensitive…
Target Selection for the SDSS-III MARVELS Survey
Martin Paegert, Keivan G. Stassun, Nathan De Lee +8
We present the target selection process for the Multi-object APO Radial Velocity Exoplanets Large-area Survey (MARVELS), which is part of the Sloan Digital Sky Survey (SDSS) III. M…
Mock Quasar-Lyman-α Forest Data-sets for the SDSS-III Baryon Oscillation Spectroscopic Survey
Julian E. Bautista, Stephen Bailey, Andreu Font-Ribera +15
We describe mock data-sets generated to simulate the high-redshift quasar sample in Data Release 11 (DR11) of the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS). The mock…
SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
Daniel J. Eisenstein, David H. Weinberg, Eric Agol +237
Building on the legacy of the Sloan Digital Sky Survey (SDSS-I and II), SDSS-III is a program of four spectroscopic surveys on three scientific themes: dark energy and cosmological…
Analytical Solution of Transverse Oscillation in Cyclotron Using LP Method
Kai Zhou, Yuntao Song, Kaizhong Ding +2
We have carried out an approximate analytical solution to precisely consider the influence of magnetic field on the transverse oscillation of particles in cyclotron. The differenti…
A Glimpse at Quasar Host Galaxy Far-UV Emission, Using DLAs as Natural Coronagraphs
Zheng Cai, Xiaohui Fan, Pasquier Noterdaeme +12
In merger-driven models of massive galaxy evolution, the luminous quasar phase is expected to be accompanied by vigorous star formation in quasar host galaxies. In this paper, we u…
How Close Are We To Detecting Earth-like Planets in the Habitable Zone Using the Radial Velocity Technique?
Ji Wang, Jian Ge
Discovering an Earth-like exoplanet in habitable zone is an important milestone for astronomers in search of extra-terrestrial life. While the radial velocity (RV) technique remain…
Discovering Faint and High Apparent Motion Rate Near-Earth Asteroids Using A Deep Learning Program
Franklin Wang, Jian Ge, Kevin Willis
Although many near-Earth objects have been found by ground-based telescopes, some fast-moving ones, especially those near detection limits, have been missed by observatories. We de…
On-Sky Demonstration of a Linear Band-limited Mask with Application to Visual Binary Stars
Justin R. Crepp, Eugene Serabyn, Joseph Carson +2
We have designed and built the first band-limited coronagraphic mask used for ground-based high-contrast imaging observations. The mask resides in the focal plane of the near-infra…
High Dust Depletion in Two Intervening Quasar Absorption Line Systems with the 2175-Ã Extinction Bump at
Peng Jiang, Jian Ge, J. Xavier Prochaska +3
We present the column densities of heavy-elements and dust depletion studies in twostrong Mg~II absorption systems at displaying the 2175-Ã dust extinction feature. Colu…
The Sloan Digital Sky Survey Quasar Catalog: twelfth data release
Isabelle Pâris, Patrick Petitjean, Nicholas P. Ross +43
We present the Data Release 12 Quasar catalog (DR12Q) from the Baryon Oscillation Spectroscopic Survey (BOSS) of the SDSS-III. This catalog includes all SDSS-III/BOSS objects that…
Very Low Mass Stellar and Substellar Companions to Solar-Like Stars From MARVELS V: A Low Eccentricity Brown Dwarf from the Driest Part of the Desert, MARVELS-6b
Nathan De Lee, Jian Ge, Justin R. Crepp +43
We describe the discovery of a likely brown dwarf (BD) companion with a minimum mass of 31.7 +/- 2.0 M_Jup to GSC 03546-01452 from the MARVELS radial velocity survey, which we desi…
Revealing the host galaxy of a quasar 2175 Ã dust absorber at z = 2.12
Jingzhe Ma, Gabriel Brammer, Jian Ge +2
We report the first detection of the host galaxy of a strong 2175 Ã dust absorber at z = 2.12 towards the background quasar SDSS J121143.42+083349.7 using HST/WFC3 IR F140W dir…
Application of Hilbert-Huang decomposition to reduce noise and characterize for NMR FID signal of proton precession magnetometer
Huan Liu, Haobin Dong, Zheng Liu +3
The parameters in a nuclear magnetic resonance (NMR) free induction decay (FID) signal contain information that is useful in magnetic field measurement, magnetic resonance sounding…
Measuring Stellar Radial Velocities with a Dispersed Fixed-Delay Interferometer
Suvrath Mahadevan, Julian van Eyken, Jian Ge +5
We demonstrate the ability to measure precise stellar barycentric radial velocities with the dispersed fixed-delay interferometer technique using the Exoplanet Tracker (ET), an ins…
Spectroscopy of PKS 0528-260: New Limits on CO Absorption and Emission
Jian Ge, Jill Bechtold, Constance Walker +2
We have obtained a moderate resolution spectrum of the quasar PKS 0528-250 with the Red Channel Spectrograph on the Multiple Mirror Telescope (MMT) in order to study a damped Lyman…
A Cautionary Tale: MARVELS Brown Dwarf Candidate Reveals Itself To Be A Very Long Period, Highly Eccentric Spectroscopic Stellar Binary
Claude E. Mack, Jian Ge, Rohit Deshpande +42
We report the discovery of a highly eccentric, double-lined spectroscopic binary star system (TYC 3010-1494-1), comprising two solar-type stars that we had initially identified as…
Exploring the Brown Dwarf Desert: New Substellar Companions from the SDSS-III MARVELS Survey
Nolan Grieves, Jian Ge, Neil Thomas +27
Planet searches using the radial velocity technique show a paucity of companions to solar-type stars within ~5 AU in the mass range of ~10 - 80 M. This deficit, know…
The 0.1<z<1.65 evolution of the bright end of the [OII] luminosity function
Johan Comparat, Johan Richard, Jean-Paul Kneib +33
We present the [OII] luminosity function measured in the redshift range 0.1<z<1.65 with unprecedented depth and accuracy. Our measurements are based on medium resolution flux-calib…
Almost Nonnegative Ricci curvature and new vanishing theorems for genera
Xiaoyang Chen, Jian Ge, Fei Han
We derive several vanishing theorems for genera under almost nonnegative Ricci curvature and infinite fundamental group, which includes Todd genus, -genus, elliptic ge…
Seven broad absorption line quasars with excess broad band absorption near 2250 Ã
Shaohua Zhang, Jian Ge, Peng Jiang +6
We report the discovery of excess broad band absorption near 2250 A (EBBA) in the spectra of seven broad absorption line (BAL) quasars. By comparing with the statistical results fr…
Very Low-mass Stellar and Substellar Companions to Solar-like Stars from Marvels III: A Short-Period Brown Dwarf Candidate Around An Active G0Iv Subgiant
Bo Ma, Jian Ge, Rory Barnes +45
We present an eccentric, short-period brown dwarf candidate orbiting the active, slightly evolved subgiant star TYC 2087-00255-1, which has effective temperature T_eff = 5903+/-42…
The Sloan Digital Sky Survey Reverberation Mapping Project: First Broad-line Hbeta and MgII Lags at z>~0.3 from six-Month Spectroscopy
Yue Shen, Keith Horne, C. J. Grier +26
Reverberation mapping (RM) measurements of broad-line region (BLR) lags in z>0.3 quasars are important for directly measuring black hole masses in these distant objects, but so far…
Companions to APOGEE Stars I: A Milky Way-Spanning Catalog of Stellar and Substellar Companion Candidates and their Diverse Hosts
Nicholas W. Troup, David L. Nidever, Nathan De Lee +24
In its three years of operation, the Sloan Digital Sky Survey (SDSS-III) Apache Point Observatory Galactic Evolution Experiment (APOGEE-1) observed 14,000 stars with enough epoc…
The z=5 Quasar Luminosity Function from SDSS Stripe 82
Ian D. McGreer, Linhua Jiang, Xiaohui Fan +12
We present a measurement of the Type I quasar luminosity function at z=5 using a large sample of spectroscopically confirmed quasars selected from optical imaging data. We measure…
Unshifted Metastable He I* Mini-Broad Absorption Line System in the Narrow Line Type 1 Quasar SDSS J080248.18551328.9
Tuo Ji, Hongyan Zhou, Peng Jiang +11
We report the identification of an unusual absorption line system in the quasar SDSS J080248.18551328.9 and present a detailed study of the system, incorporating follow-up optic…
Discovering Ca II Absorption Lines With a Neural Network
Iona Xia, Jian Ge, Kevin Willis +1
Quasar absorption line analysis is critical for studying gas and dust components and their physical and chemical properties as well as the evolution and formation of galaxies in th…
An On-going Mid-infrared Outburst in the White Dwarf 0145+234: Catching in Action of Tidal Disruption of an Exoasteroid?
Ting-Gui Wang, Ning Jiang, Jian Ge +7
We report the detection of a large amplitude MIR outburst in the white dwarf (WD) 0145+234 in the NEOWISE Survey data. The source had a stable MIR flux before 2018, and was brighte…
Data Reduction Pipeline of the TOU Optical Very High Resolution Spectrograph and Its sub-m/s Performance
Bo Ma, Jian Ge
TOU is an extremely high resolution optical spectrograph (R=, 380-900~nm), which is designed to detect low mass exoplanets using the radial velocity technique.We describe…
A Search for Li in Lithium-Poor Stars with Planets
Avi M. Mandell, Jian Ge, Norm Murray
Using high-resolution, high quality spectra we investigate the presence of Li in two lithium-poor stars that host extrasolar planetary systems. We present improved atomic and m…
The 2175 Ã ~ Bump Features in FeLoBAL Quasars: One Indicator of MW-like Dust in the Nuclear Region of Quasar
Shaohua Zhang, Jian Ge, Tuo Ji +8
To investigate the properties of dust in the nuclear region of quasars, we explored the extinction curves of the iron low-ionization broad absorption line (FeLoBAL) quasar SDSS J16…
The Cross-correlation of MgII Absorption and Galaxies in BOSS
Ignasi Pérez-Rà fols, Jordi Miralda-Escudé, Britt Lundgren +5
We present a measurement of the cross-correlation of MgII absorption and massive galaxies, using the DR11 main galaxy sample of the Baryon Oscillation Spectroscopic Survey of SDSS-…
MARVELS: Revealing the Formation and Dynamical Evolution of Giant Planet Systems
Jian Ge, Daniel Eisenstein, B. Scott Gaudi +1
MARVELS, the Multi-Object APO Radial Velocity Exoplanet Large-area Survey, is a 6-year program to characterize the distribution of gas giant planets with orbital periods ranging fr…
Molecular Hydrogen in the Damped Ly alpha Absorber of Q1331+170
Jun Cui, Jill Bechtold, Jian Ge +1
We used HST/STIS to obtain the spectrum of molecular hydrogen associated with the damped Ly system at toward the quasar Q1331+170 at . St…
High Contrast Imaging of Extrasolar Planets
John H. Debes, Jian Ge
Gaussian aperture pupil masks (GAPMs) can in theory achieve the contrast requisite for directly imaging an extrasolar planet. We use lab tests and simulations to further study thei…
Fixed-delay Interferometry for Doppler Extra-solar Planet Detection
Jian Ge
We present a new technique based on fixed-delay interferometry for high throughput, high precision and multi-object Doppler radial velocity (RV) surveys for extra-solar planets. Th…
Quasars with PV broad absorption in BOSS data release 9
Daniel M. Capellupo, Fred Hamann, Hanna Herbst +7
Broad absorption lines (BALs) found in a significant fraction of quasar spectra identify high-velocity outflows that might be present in all quasars and could be a major factor in…
Discovery of a Low-Mass Companion to a Metal-Rich F Star with the MARVELS Pilot Project
Scott W. Fleming, Jian Ge, Suvrath Mahadevan +34
We report the discovery of a low-mass companion orbiting the metal-rich, main sequence F star TYC 2949-00557-1 during the MARVELS (Multi-object APO Radial Velocity Exoplanet Large-…
The TESS Objects of Interest Catalog from the TESS Prime Mission
Natalia M. Guerrero, S. Seager, Chelsea X. Huang +102
We present 2,241 exoplanet candidates identified with data from the Transiting Exoplanet Survey Satellite (TESS) during its two-year prime mission. We list these candidates in the…
ET White Paper: To Find the First Earth 2.0
Jian Ge, Hui Zhang, Weicheng Zang +163
We propose to develop a wide-field and ultra-high-precision photometric survey mission, temporarily named "Earth 2.0 (ET)". This mission is designed to measure, for the first time,…
The first super-Earth Detection from the High Cadence and High Radial Velocity Precision Dharma Planet Survey
Bo Ma, Jian Ge, Matthew Muterspaugh +23
The Dharma Planet Survey (DPS) aims to monitor about 150 nearby very bright FGKM dwarfs (within 50 pc) during 20162020 for low-mass planet detection and characterization using t…
Gluing of multiple Alexandrov spaces
Jian Ge, Nan Li
In this paper we discuss the sufficient and necessary conditions for multiple Alexandrov spaces being glued to an Alexandrov space. We propose a Gluing Conjecture, which says that…
Mesosphere Sodium Column Density and the Sodium Laser Guide Star Brightness
Jian Ge, J. R. P. Angel, B. D. Jacobsen +7
The first time simultaneous measurements of sodium column density and the absolute flux from a sodium laser guide star, created by a monochromatic 3 W cw laser, tuned to the peak o…
From Dust To Planetesimal: The Snowball Phase ?
Ji-Wei Xie, Matthew J. Payne, Philippe Thebault +2
The standard model of planet formation considers an initial phase in which planetesimals form from a dust disk, followed by a phase of mutual planetesimal-planetesimal collisions,…
Detections of the 2175 Ã Dust Feature at 1.4z 1.5 from the Sloan Digital Sky Survey
Junfeng Wang, Patrick B. Hall, Jian Ge +2
The strongest spectroscopic dust extinction feature in the Milky Way, the broad absorption bump at 2175 Ã , is generally believed to be caused by aromatic carbonaceous materials --…
Detecting Ca II Absorption Lines with a Fe II assisted Dual Neural Network
Lucas Wang, Jian Ge, Kevin Willis
Ca II absorbers, characterized by dusty and metal-rich environments, provide unique insights into the interstellar medium of galaxies. However, their rarity and weak absorption fea…
Newly discovered Ca II absorbers in the early universe: statistics, element abundances and dust
Hannah Fang, Iona Xia, Jian Ge +2
We report discoveries of 165 new quasar Ca II absorbers from the Sloan Digital Sky Survey (SDSS) Data Release 7 and 12. Our Ca II rest frame equivalent width distribution supports…
A Search for Sodium Absorption from Comets Around HD209458
Caylin Mendelowitz, Jian Ge, Avi M. Mandell +1
We monitored the planet-bearing solar-type star HD209458 for sodium absorption in the region of the stellar NaI D1 line that would be indicative of cometary activity in the system.…
The BOSS Lyman-alpha Forest Sample from SDSS Data Release 9
Khee-Gan Lee, Stephen Bailey, Leslie E. Bartsch +50
We present the BOSS Lyman-alpha (Lya) Forest Sample from SDSS Data Release 9, comprising 54,468 quasar spectra with zqso > 2.15 suitable for Lya forest analysis. This data set prob…
Sharp Weitzenböck and PIC2 Estimates from Sectional-Scalar Curvature Pinching
Jian Ge
Let be an -dimensional Euclidean vector space, ,where , and . We prove the sharp pointwise estimate \[ q_2(E) \ge -\frac{2(\ell -1)…
Fundamental Performance of a Dispersed Fixed Delay Interferometer In Searching For Planets Around M Dwarfs
Ji Wang, Jian Ge, Peng Jiang +1
We present a new method to calculate fundamental Doppler measurement limits with a dispersed fixed-delay interferometer (DFDI) in the near infrared wavelength region for searching…
A Metal-Strong and Dust-Rich Damped \lya Absorption System toward the Quasar SDSS J115705.52+615521.7
Jian-Guo Wang, Hong-Yan Zhou, Jian Ge +7
(Abridged for arXiv) We report the discovery of an unusual, extremely dust-rich and metal-strong damped \lya absorption system (DLA) at a redshift toward the quasar…
Constraint on the time variation of the fine-structure constant with the SDSS-III/BOSS DR12 quasar sample
Franco D. Albareti, Johan Comparat, Carlos M. Gutiérrez +9
From the Sloan Digital Sky Survey (SDSS) Data Release 12, which covers the full Baryonic Oscillation Spectroscopic Survey (BOSS) footprint, we investigate the possible variation of…
Comparison Theorems for Manifold with Mean Convex Boundary
Jian Ge
Let be an -dimensional Riemannian manifold with boundary . Assume that Ricci curvature is bounded from below by , for $k\in \RR$, we give a sharp estim…
Soul Theorem for 4-dimensional Topologically Regular Open Nonnegatively Curved Alexandrov Spaces
Jian Ge
In this paper, we study the topology of topologically regular 4-dimensional open non-negatively curved Alexandrov spaces. These spaces occur naturally as the blow-up limits of comp…
Fast Inflow Directly Feeding Black Hole Accretion Disk in Quasars
Hongyan Zhou, Xiheng Shi, Weimin Yuan +21
Quasars are high-luminosity active galactic nuclei believed to be powered by accretion of interstellar matter onto a super-massive black hole (SMBH) therein. Most of the observed e…
Eighth-Order Image Masks for Terrestrial Planet Finding
Marc J. Kuchner, Justin Crepp, Jian Ge
We describe a new series of band-limited image masks for coronagraphy that are insensitive to pointing errors and other low-spatial-frequency optical aberrations. For a modest cost…
Comparative Lyot Coronagraphy with Extreme AO Systems
Justin Crepp, Andrew Vanden Heuvel, Jian Ge
As adaptive optics technology continues to improve, the stellar coronagraph will play an ever increasing role in ground-based high-contrast imaging observations. Though several dif…
A New Measurements of the Cosmic Microwave Background Radiation Temperature at z = 1.97
Jian Ge, Jill Bechtold, John H. Black
We present detections of absorption from the ground state and excited states of C I in the z = 1.9731 damped Ly\al\ system of the QSO 0013004. The excitation temperature between…
Very Low-Mass Stellar and Substellar Companions to Solar-like Stars From MARVELS VI: A Giant Planet and a Brown Dwarf Candidate in a Close Binary System HD 87646
Bo Ma, Jian Ge, Alex Wolszczan +34
We report the detections of a giant planet (MARVELS-7b) and a brown dwarf candidate (MARVELS-7c) around the primary star in the close binary system, HD 87646. It is the first close…
Eclipsing Binary Science Via the Merging of Transit and Doppler Exoplanet Survey Data - A Case Study With the MARVELS Pilot Project and SuperWASP
Scott W. Fleming, Pierre F. L. Maxted, Leslie Hebb +28
Exoplanet transit and Doppler surveys discover many binary stars during their operation that can be used to conduct a variety of ancillary science. Specifically, eclipsing binary s…
The Sloan Digital Sky Survey quasar catalog: tenth data release
Isabelle Pâris, Patrick Petitjean, Ãric Aubourg +47
We present the Data Release 10 Quasar (DR10Q) catalog from the Baryon Oscillation Spectroscopic Survey (BOSS) of the Sloan Digital Sky Survey III. The catalog includes all BOSS obj…
Simulations for Multi-Object Spectrograph Planet Surveys
Stephen R. Kane, Donald P. Schneider, Jian Ge
Radial velocity surveys for extra-solar planets generally require substantial amounts of large telescope time in order to monitor a sufficient number of stars. Two of the aspects w…
The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey
III Collaboration, Christopher P. Ahn, Rachael Alexandroff +224
The Sloan Digital Sky Survey III (SDSS-III) presents the first spectroscopic data from the Baryon Oscillation Spectroscopic Survey (BOSS). This ninth data release (DR9) of the SDSS…
Investigating Emission Line Galaxy Surveys with the Sloan Digital Sky Survey Telescope
Johan Comparat, Jean-Paul Kneib, Stephanie Escoffier +22
The Baryon Acoustic Oscillation (BAO) feature in the power spectrum of galaxies provides a standard ruler to probe the accelerated expansion of the Universe. The current surveys co…
Probing the Circumgalactic Medium at High-Redshift Using Composite BOSS Spectra of Strong Lyman-alpha Forest Absorbers
Matthew M. Pieri, Michael J. Mortonson, Stephan Frank +17
We present composite spectra constructed from a sample of 242,150 Lyman-alpha (Lya) forest absorbers at redshifts 2.4<z<3.1 identified in quasar spectra from the Baryon Oscillation…
The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
Shadab Alam, Franco D. Albareti, Carlos Allende Prieto +271
The third generation of the Sloan Digital Sky Survey (SDSS-III) took data from 2008 to 2014 using the original SDSS wide-field imager, the original and an upgraded multi-object fib…
Radius estimates for Alexandrov space with boundary
Jian Ge, Ronggang Li
In this note, we study the radius of positively curved or non-negatively curved Alexandrov space with strictly convex boundary, with convexity measured by the Base-Angle defined by…
BOSS Ultracool Dwarfs I: Colors and Magnetic Activity of M and L dwarfs
Sarah J. Schmidt, Suzanne L. Hawley, Andrew A. West +4
We present the colors and activity of ultracool (M7-L8) dwarfs from the Tenth Data Release of the Sloan Digital Sky Survey (SDSS). We combine previous samples of SDSS M and L dwarf…
Quasar 2175 Ã dust absorbers II: Correlation analysis and relationship with other absorption line systems
Jingzhe Ma, Jian Ge, J. Xavier Prochaska +6
We present the cold neutral content (H I and C I gas) of 13 quasar 2175 Ã dust absorbers (2DAs) at = 1.6 - 2.5 to investigate the correlation between the presence of the UV…
Identifying the Absorption Bump with Deep Learning
Min Li, Sudeep Gaddam, Xiaolin Li +3
The pervasive interstellar dust grains provide significant insights to understand the formation and evolution of the stars, planetary systems, and the galaxies, and may harbor the…
1/4-Pinched Contact Sphere Theorem
Jian Ge, Yang Huang
Given a closed contact 3-manifold with a compatible Riemannian metric, we show that if the sectional curvature is 1/4-pinched, then the contact structure is universally tight. This…
The Tenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Apache Point Observatory Galactic Evolution Experiment
Christopher P. Ahn, Rachael Alexandroff, Carlos Allende Prieto +232
The Sloan Digital Sky Survey (SDSS) has been in operation since 2000 April. This paper presents the tenth public data release (DR10) from its current incarnation, SDSS-III. This da…
The Transiting Exoplanet Survey Satellite
George R. Ricker, Joshua N. Winn, Roland Vanderspek +55
The Transiting Exoplanet Survey Satellite (TESS) will search for planets transiting bright and nearby stars. TESS has been selected by NASA for launch in 2017 as an Astrophysics Ex…