392 citations · 1.9k across the 21 of their papers we have counts for
17 papers · 1 filter
Fully fluorinated non-carbon compounds NF3 and SF6 as ideal technosignature gases
Sara Seager, Janusz J. Petkowski, Jingcheng Huang +3
Waste gas products from technological civilizations may accumulate in an exoplanet atmosphere to detectable levels. We propose nitrogen trifluoride (NF3) and sulfur hexafluoride (S…
Photochemical Runaway in Exoplanet Atmospheres: Implications for Biosignatures
Sukrit Ranjan, Sara Seager, Zhuchang Zhan +5
About 2.5 billion years ago, microbes learned to harness plentiful solar energy to reduce CO with HO, extracting energy and producing O as waste. O production from…
Venusian phosphine: a 'Wow!' signal in chemistry?
William Bains, Janusz J. Petkowski, Sara Seager +6
The potential detection of ppb levels phosphine (PH3) in the clouds of Venus through millimeter-wavelength astronomical observations is extremely surprising as PH3 is an unexpected…
Assessment of Ammonia as a Biosignature Gas in Exoplanet Atmospheres
Jingcheng Huang, Sara Seager, Janusz J. Petkowski +2
Ammonia (NH3) in a terrestrial planet atmosphere is generally a good biosignature gas, primarily because terrestrial planets have no significant known abiotic NH3 source. The condi…
Assessment of Isoprene as a Possible Biosignature Gas in Exoplanets with Anoxic Atmospheres
Zhuchang Zhan, Sara Seager, Janusz Jurand Petkowski +4
Research for possible biosignature gases on habitable exoplanet atmosphere is accelerating. We add isoprene, C5H8, to the roster of biosignature gases. We found that formation of i…
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…
Persistence of Flare-Driven Atmospheric Chemistry on Rocky Habitable Zone Worlds
Howard Chen, Zhuchang Zhan, Allison Youngblood +3
Low-mass stars show evidence of vigorous magnetic activity in the form of large flares and coronal mass ejections. Such space weather events may have important ramifications for th…
Phosphine Gas in the Cloud Decks of Venus
Jane S. Greaves, Anita M. S. Richards, William Bains +16
Measurements of trace-gases in planetary atmospheres help us explore chemical conditions different to those on Earth. Our nearest neighbor, Venus, has cloud decks that are temperat…
Phosphine on Venus Cannot be Explained by Conventional Processes
William Bains, Janusz J. Petkowski, Sara Seager +6
The recent candidate detection of ~1 ppb of phosphine in the middle atmosphere of Venus is so unexpected that it requires an exhaustive search for explanations of its origin. Phosp…
A remnant planetary core in the hot-Neptune desert
David J. Armstrong, Théo A. Lopez, Vardan Adibekyan +91
The interiors of giant planets remain poorly understood. Even for the planets in the Solar System, difficulties in observation lead to large uncertainties in the properties of plan…
Three Short Period Jupiters from TESS
L. D. Nielsen, R. Brahm, F. Bouchy +74
We report the confirmation and mass determination of three hot Jupiters discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HIP 65Ab (TOI-129, TIC-201248411) is…
Phosphine as a Biosignature Gas in Exoplanet Atmospheres
Clara Sousa-Silva, Sara Seager, Sukrit Ranjan +4
A long-term goal of exoplanet studies is the identification and detection of biosignature gases. Beyond the most discussed biosignature gas O, only a handful of gases have been…
Habitability and Spectroscopic Observability of Warm M-dwarf Exoplanets Evaluated with a 3D Chemistry-Climate Model
Howard Chen, Eric T. Wolf, Zhuchang Zhan +1
Planets residing in circumstellar habitable zones (CHZs) offer our best opportunities to test hypotheses of life's potential pervasiveness and complexity. Constraining the precise…
An Eccentric Massive Jupiter Orbiting a Sub-Giant on a 9.5 Day Period Discovered in the Transiting Exoplanet Survey Satellite Full Frame Images
Joseph E. Rodriguez, Samuel N. Quinn, Chelsea X. Huang +71
We report the discovery of TOI-172 b from the Transiting Exoplanet Survey Satellite (TESS) mission, a massive hot Jupiter transiting a slightly evolved G-star with a 9.48-day orbit…
Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfs
Maximilian N. Günther, Zhuchang Zhan, Sara Seager +21
We perform a study of stellar flares for the 24,809 stars observed with 2 minute cadence during the first two months of the TESS mission. Flares may erode exoplanets' atmospheres a…
TESS delivers its first Earth-sized planet and a warm sub-Neptune
Diana Dragomir, Johanna Teske, Maximilian N. Gunther +48
The future of exoplanet science is bright, as TESS once again demonstrates with the discovery of its longest-period confirmed planet to date. We hereby present HD 21749b (TOI 186.0…
A TESS Dress Rehearsal: Planetary Candidates and Variables from K2 Campaign 17
Ian J. M. Crossfield, Natalia Guerrero, Trevor David +38
We produce light curves for all ~34,000 targets observed with K2 in Campaign 17 (C17), identifying 34 planet candidates, 184 eclipsing binaries, and 222 other periodic variables. T…