Publications (23)
Kepler-1656b's Extreme Eccentricity: Signature of a Gentle Giant
Isabel Angelo, Smadar Naoz, Erik Petigura +4
Highly eccentric orbits are one of the major surprises of exoplanets relative to the Solar System and indicate rich and tumultuous dynamical histories. One system of particular int…
Demographics of Protoplanetary Disks: A Simulated Population of Edge-on Systems
Isabel Angelo, Gaspard Duchêne, Karl Stapelfeldt +9
The structure of protoplanetary disks plays an essential role in planet formation. Disks that are highly inclined, or ''edge-on'', are of particular interest since their geometry p…
Planet Masses, Radii, and Orbits from NASA's K2 Mission
Andrew W. Howard, Evan Sinukoff, Sarah Blunt +50
We report the masses, sizes, and orbital properties of 86 planets orbiting 55 stars observed by NASA's K2 Mission with follow-up Doppler measurements by the HIRES spectrometer at t…
The TESS-Keck Survey XX: 15 New TESS Planets and a Uniform RV Analysis of all Survey Targets
Alex S. Polanski, Jack Lubin, Corey beard +69
The Transiting Exoplanet Survey Satellite (TESS) has discovered hundreds of new worlds, with TESS planet candidates now outnumbering the total number of confirmed planets from $\te…
The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars
Mason G. MacDougall, Erik A. Petigura, Gregory J. Gilbert +38
We present the stellar and planetary properties for 85 TESS Objects of Interest (TOIs) hosting 108 planet candidates which comprise the TESS-Keck Survey (TKS) sample. We combine ph…
orbitize!: A Comprehensive Orbit-fitting Software Package for the High-contrast Imaging Community
Sarah Blunt, Jason Wang, Isabel Angelo +10
orbitize! is an open-source, object-oriented software package for fitting the orbits of directly-imaged objects. It packages the Orbits for the Impatient (OFTI) algorithm and a par…
The TESS-Keck Survey XXIV: Outer Giants may be More Prevalent in the Presence of Inner Small Planets
Judah Van Zandt, Erik A. Petigura, Jack Lubin +38
We present the results of the Distant Giants Survey, a three-year radial velocity (RV) campaign to search for wide-separation giant planets orbiting Sun-like stars known to host an…
Once a Triple, Not Always a Triple: The Evolution of Hierarchical Triples that Yield Merged Inner Binaries
Cheyanne Shariat, Smadar Naoz, Kareem El-Badry +4
More than half of all main-sequence (MS) stars have one or more companions, and many of those with initial masses <8 M are born in hierarchical triples. These systems featu…
A Data-driven Spectral Model of Main Sequence Stars in Gaia DR3
Isabel Angelo, Megan Bedell, Erik Petigura +1
Precise spectroscopic classification of planet hosts is an important tool of exoplanet research at both the population and individual system level. In the era of large-scale survey…
The TESS Grand Unified Hot Jupiter Survey. I. Ten TESS Planets
Samuel W. Yee, Joshua N. Winn, Joel D. Hartman +69
We report the discovery of ten short-period giant planets (TOI-2193A b, TOI-2207 b, TOI-2236 b, TOI-2421 b, TOI-2567 b, TOI-2570 b, TOI-3331 b, TOI-3540A b, TOI-3693 b, TOI-4137 b)…
Seeking Spectroscopic Binaries with Data-Driven Models
Isabel Angelo, Erik Petigura, Megan Bedell
Data-driven stellar classification has a long and important history in astronomy, dating as far back as Annie Jump Cannon's "by eye" classifications of stars into spectral types st…
The 50-Myr-Old TOI-942c is Likely on an Aligned, Coplanar Orbit and Losing Mass
Huan-Yu Teng, Fei Dai, Andrew W. Howard +4
We report the observation of the transiting planet TOI-942c, a Neptunian planet orbiting a young K-type star approximately 50 Myr years old. Using Keck/HIRES, we observed a partial…
The California Legacy Survey V. Chromospheric Activity Cycles in Main Sequence Stars
Howard Isaacson, Andrew W. Howard, Benjamin Fulton +31
We present optical spectroscopy of 710 solar neighborhood stars collected over twenty years to catalog chromospheric activity and search for stellar activity cycles. The California…
A Case for an Atmosphere on Super-Earth 55 Cancri e
Isabel Angelo, Renyu Hu
One of the primary questions when characterizing Earth-sized and super-Earth-sized exoplanets is whether they have a substantial atmosphere like Earth and Venus or a bare-rock surf…
Kepler-1649b: An Exo-Venus in the Solar Neighborhood
Isabel Angelo, Jason F. Rowe, Steve B. Howell +8
The Kepler mission has revealed that Earth-sized planets are common, and dozens have been discovered to orbit in or near their host star's habitable zone. A major focus in astronom…
The TESS-Keck Survey. XIII. An Eccentric Hot Neptune with a Similar-Mass Outer Companion around TOI-1272
Mason G. MacDougall, Erik A. Petigura, Tara Fetherolf +58
We report the discovery of an eccentric hot Neptune and a non-transiting outer planet around TOI-1272. We identified the eccentricity of the inner planet, with an orbital period of…
Dynamical Evolution of White Dwarfs in Triples in the Era of Gaia
Cheyanne Shariat, Smadar Naoz, Bradley M. S. Hansen +3
The mission has detected many white dwarfs (WDs) in binary and triple configurations, and while observations suggest that triple stellar systems are common in our Galaxy, no…
Triple Evolution Pathways to Black Hole Low-Mass X-ray Binaries: Insights from V404 Cygni
Cheyanne Shariat, Smadar Naoz, Kareem El-Badry +5
A recent discovery shows that V404 Cygni, a prototypical black hole low-mass X-ray binary (BH-LMXB) is a hierarchical triple: the BH and donor star are orbited by a M$_{\odot…
The TESS-Keck Survey. VI. Two Eccentric sub-Neptunes Orbiting HIP-97166
Mason G. MacDougall, Erik A. Petigura, Isabel Angelo +45
We report the discovery of HIP-97166b (TOI-1255b), a transiting sub-Neptune on a 10.3-day orbit around a K0 dwarf 68 pc from Earth. This planet was identified in a systematic searc…
Obliquity Constraints for the Extremely Eccentric Sub-Saturn Kepler-1656 b
Ryan A. Rubenzahl, Andrew W. Howard, Samuel Halverson +25
The orbits of close-in exoplanets provide clues to their formation and evolutionary history. Many close-in exoplanets likely formed far out in their protoplanetary disks and migrat…
The TESS-Keck Survey. XXII. A sub-Neptune Orbiting TOI-1437
Daria Pidhorodetska, Emily A. Gilbert, Stephen R. Kane +40
Exoplanet discoveries have revealed a dramatic diversity of planet sizes across a vast array of orbital architectures. Sub-Neptunes are of particular interest; due to their absence…
The TESS-Keck Survey. XVI. Mass Measurements for 12 Planets in Eight Systems
Joseph M. Akana Murphy, Natalie M. Batalha, Nicholas Scarsdale +44
With JWST's successful deployment and unexpectedly high fuel reserves, measuring the masses of sub-Neptunes transiting bright, nearby stars will soon become the bottleneck for char…
The TESS-Keck Survey. XII. A Dense 1.8 R Ultra-Short-Period Planet Possibly Clinging to a High-Mean-Molecular-Weight Atmosphere After the First Gyr
Ryan A. Rubenzahl, Fei Dai, Andrew W. Howard +39
The extreme environments of ultra-short-period planets (USPs) make excellent laboratories to study how exoplanets obtain, lose, retain, and/or regain gaseous atmospheres. We presen…