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19912026
Showing 2018Show all

483 papers · 1 filter

astro-ph.SR2018★ 28 cited

Episodic excursions of low-mass protostars on the Hertzsprung-Russell diagram

Vardan G. Elbakyan, Eduard I. Vorobyov, Christian Rab +4

Following our recent work devoted to the effect of accretion on the pre-main-sequence evolution of low-mass stars, we perform a detailed analysis of episodic excursions of low-mass…

astro-ph.EP2018★ 33 cited

Spectrophotometric Modeling and Mapping of Ceres

Jian-Yang Li, Stefan E. Schröder, Stefano Mottola +8

We report a comprehensive analysis of the global spectrophotometric properties of Ceres using Dawn Framing Camera images collected from April to June 2015 during the RC3 and Survey…

astro-ph.EP2018★ 7 cited

ROSETTA/OSIRIS observations of the 67P nucleus during the April 2016 flyby: high-resolution spectrophotometry

C. Feller, S. Fornasier, S. Ferrari +35

In April 2016, the Rosetta spacecraft performed a low-altitude low-phase-angle flyby over the Imhotep-Khepry transition of 67P/Churyumov-Gerasimenko's nucleus. The OSIRIS/Narrow-An…

astro-ph.EP2018★ 24 cited

Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system

Ruben Asensio-Torres, Thayne Currie, Markus Janson +24

We present SCExAO/CHARIS 1.1--2.4 micron integral field direct spectroscopy of the young HIP 79124 triple system. HIP 79124 is a member of the Scorpius-Centaurus association, consi…

astro-ph.SR2018★ 41 cited

3He-Rich Solar Energetic Particles from Sunspot Jets

R. Bucik, M. E. Wiedenbeck, G. M. Mason +3

Solar sources of suprathermal (<1 MeV/nucleon) 3He-rich solar energetic particles (SEPs) have been commonly associated with jets originating in small, compact active regions at the…

astro-ph.SR2018★ 14 cited

IRAM and Gaia views of multi-episodic star formation in IC1396A: The origin and dynamics of the Class 0 protostar at the edge of an HII region

Aurora Sicilia-Aguilar, Nimesh Patel, Min Fang +3

(Abridged) IC1396A is a cometary globule containing the Class 0 source IC1396A-PACS-1. We use IRAM 30m and Gaia DR2 data to explore the star-formation history of IC1396A and invest…

astro-ph.GA2018★ 38 cited

SOFIA Far Infrared Imaging Polarimetry of M82 and NGC 253: Exploring the Super-Galactic Wind

Terry Jay Jones, C. Darren Dowell, Enrique Lopez Rodriguez +22

We present Far-Infrared polarimetry observations of M82 at 53 and and NGC 253 at , which were taken with HAWC+ in polarimetry mode on the Stratospheric Ob…

astro-ph.GA2018★ 29 cited

Thermal balance and comparison of gas and dust properties of dense clumps in the Hi-GAL survey

Manuel Merello, Sergio Molinari, Kazi L. J. Rygl +7

We present a comparative study of physical properties derived from gas and dust emission in a sample of 1068 dense Galactic clumps. The sources are selected from the crossmatch of…

astro-ph.GA2018★ 27 cited

An Ammonia Spectral Map of the L1495-B218 Filaments in the Taurus Molecular Cloud: II CCS & HCN Chemistry and Three Modes of Star Formation in the Filaments

Young Min Seo, Liton Majumdar, Paul F. Goldsmith +22

We present deep CCS and HCN observations of the L1495-B218 filaments in the Taurus molecular cloud obtained using the K-band focal plane array on the 100m Green Bank Telescope.…

astro-ph.HE2018★ 845 cited

Relativistic Jets in Active Galactic Nuclei

Roger Blandford, David Meier, Anthony Readhead

The nuclei of most normal galaxies contain supermassive black holes, which can accrete gas through a disk and become active. These Active Galactic Nuclei, AGN, can form jets which…

astro-ph.GA2018★ 29 cited

Methyl cyanide (CH3CN) and propyne (CH3CCH) in the low mass protostar IRAS 16293-2422

Ines Andron, Pierre Gratier, Liton Majumdar +4

Methyl cyanide (CH3CN) and propyne (CH3CCH) are two molecules commonly used as gas thermometers for interstellar gas. They are detected in several astrophysical environments and in…

astro-ph.EP2018★ 70 cited

Probable detection of hydrogen sulphide (HS) in Neptune's atmosphere

Patrick G. J. Irwin, Daniel Toledo, Ryan Garland +4

Recent analysis of Gemini-North/NIFS H-band (1.45 - 1.8 m) observations of Uranus, recorded in 2010, with recently updated line data has revealed the spectral signature of hydro…

astro-ph.EP2018★ 206 cited

Hubble PanCET: An extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470 b

V. Bourrier, A. Lecavelier des Etangs, D. Ehrenreich +16

GJ 3470b is a warm Neptune transiting an M-dwarf star at the edge of the evaporation desert. It offers the possibility of investigating how low-mass, close-in exoplanets evolve und…

astro-ph.CO2018★ 42 cited

Dark Energy Survey Year 1 results: Validation of weak lensing cluster member contamination estimates from P(z) decomposition

T. N. Varga, J. DeRose, D. Gruen +68

Weak lensing source galaxy catalogs used in estimating the masses of galaxy clusters can be heavily contaminated by cluster members, prohibiting accurate mass calibration. In this…

astro-ph.GA2018★ 41 cited

Conditional Quenching: A detailed look at the SFR-Density Relation at z ~ 0.9 from ORELSE

Adam R. Tomczak, Brian C. Lemaux, Lori M. Lubin +10

We present a study of the star-formation rate (SFR)-density relation at z ~ 0.9 using data drawn from the Observations of Redshift Evolution in Large Scale Environments (ORELSE) su…

astro-ph.SR2018★ 22 cited

The Planet Formation Potential Around a 45 Myr old Accreting M Dwarf

Kevin M. Flaherty, A. Meredith Hughes, Eric E. Mamajek +1

Debris disk detections around M dwarfs are rare, and so far no gas emission has been detected from an M dwarf debris disk. This makes the 45 Myr old M dwarf WISEJ080822.18-644357.3…

astro-ph.HE2018★ 97 cited

The Soft-Excess in Mrk 509: Warm Corona or Relativistic Reflection?

Javier A. Garcia, Erin Kara, Dominic Walton +15

We present the analysis of the first NuSTAR observations ( ks), simultaneous with the last SUZAKU observations ( ks), of the active galactic nucleus of the brigh…

astro-ph.SR2018★ 12 cited

Discovery of δ Scuti Pulsations in the Young Hybrid Debris Disk Star HD 156623

Samuel N. Mellon, Eric E. Mamajek, Konstanze Zwintz +11

The bRing robotic observatory network was built to search for circumplanetary material within the transiting Hill sphere of the exoplanet Pic b across its bright host star …

astro-ph.IM2018★ 12 cited

A flexible GPU-accelerated radio-frequency readout for superconducting detectors

Lorenzo Minutolo, Bryan Steinbach, Albert Wandui +1

We have developed a flexible radio-frequency readout system suitable for a variety of superconducting detectors commonly used in millimeter and submillimeter astrophysics, includin…

astro-ph.GA2018★ 86 cited

Chandra centres for COSMOS X-ray galaxy groups: Differences in stellar properties between central dominant and offset brightest group galaxies

Ghassem Gozaliasl, Alexis Finoguenov, Masayuki Tanaka +24

We present the results of a search for galaxy clusters and groups in the square degree of the COSMOS field using all available X-ray observations from the XMM-Newton and Ch…

astro-ph.SR2018★ 136 cited

Preliminary Trigonometric Parallaxes of 184 Late-T and Y Dwarfs and an Analysis of the Field Substellar Mass Function into the "Planetary" Mass Regime

J. Davy Kirkpatrick, Emily C. Martin, Richard L. Smart +16

We present preliminary trigonometric parallaxes of 184 late-T and Y dwarfs using observations from Spitzer (143), USNO (18), NTT (14), and UKIRT (9). To complete the 20-pc census o…

astro-ph.GA2018★ 14 cited

The Massive and Distant Clusters of WISE Survey V: Extended Radio Sources in Massive Galaxy Clusters at z~1

Emily Moravec, Anthony H. Gonzalez, Daniel Stern +9

We present the results from a pilot study with the Karl G. Jansky Very Large Array (JVLA) to determine the radio morphologies of extended radio sources and the properties of their…

astro-ph.GA2018★ 147 cited

The Next Generation Virgo Cluster Survey. XXIII. Fundamentals of nuclear star clusters over seven decades in galaxy mass

R. Sánchez-Janssen, P. Côté, L. Ferrarese +25

Using deep, high resolution optical imaging from the Next Generation Virgo Cluster Survey we study the properties of nuclear star clusters (NSCs) in a sample of nearly 400 quiescen…

astro-ph.GA2018★ 161 cited

The NANOGrav 11-Year Data Set: Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries

K. Aggarwal, Z. Arzoumanian, P. T. Baker +60

Observations indicate that nearly all galaxies contain supermassive black holes (SMBHs) at their centers. When galaxies merge, their component black holes form SMBH binaries (SMBHB…