36 citations · 310 across the 26 of their papers we have counts for
26 papers
Detecting White Dwarf Exoplanets in the Roman Era
Zifan Lin, Tansu Daylan
White dwarfs (WDs) provide an unparalleled opportunity for detecting and characterizing exoplanets because of the large planet-to-star size ratio. However, only one transiting WD e…
Leveraging Impact Parameter to Mitigate the Transit Light Source Effect: Early Insights from TRAPPIST-1
Ana Glidden, Alexander I. Shapiro, Sara Seager +19
Stellar activity complicates exoplanet transmission spectra, particularly for smaller planets around M dwarfs with JWST. The transit light source (TLS) effect, the imprinting of sp…
Helium escaping from the atmosphere of a nearby rocky exoplanet orbiting in a habitable zone
Collin Cherubim, Shreyas Vissapragada, Tim Cunningham +13
Observations of highly irradiated gas giant exoplanets have shown helium escaping from their atmospheres. There is limited evidence for atmospheres on rocky exoplanets, perhaps bec…
JWST TRAPPIST-1 e/b Program: Motivation and first observations
Natalie H. Allen, Néstor Espinoza, V. A. Boehm +24
One of the forefront goals in the field of exoplanets is the detection of an atmosphere on a temperate terrestrial exoplanet, and among the best suited systems to do so is TRAPPIST…
JWST-TST DREAMS: The Nightside Emission and Chemistry of WASP-17b
Jacob Lustig-Yaeger, Kristin S. Sotzen, Kevin B. Stevenson +24
Theoretical studies have suggested using planetary infrared excess (PIE) to detect and characterize the thermal emission of transiting and non-transiting exoplanets, however the PI…
JWST-TST DREAMS: Sulfur dioxide in the atmosphere of the Neptune-mass planet HAT-P-26 b from NIRSpec G395H transmission spectroscopy
Amélie Gressier, Natasha E. Batalha, Nicholas Wogan +24
We present the James Webb Space Telescope (JWST) transmission spectrum of the exoplanet HAT-P-26 b (18.6 Earth masses, 6.33 Earth radii), based on a single transit observed with th…
JWST-TST DREAMS: NIRSpec/PRISM Transmission Spectroscopy of the Habitable Zone Planet TRAPPIST-1 e
Néstor Espinoza, Natalie H. Allen, Ana Glidden +32
TRAPPIST-1 e is one of the very few rocky exoplanets that is both amenable to atmospheric characterization and that resides in the habitable zone of its star -- located at a distan…
JWST-TST DREAMS: Secondary Atmosphere Constraints for the Habitable Zone Planet TRAPPIST-1 e
Ana Glidden, Sukrit Ranjan, Sara Seager +25
The TRAPPIST-1 system offers one of the best opportunities to characterize temperate terrestrial planets beyond our own solar system. Within the TRAPPIST-1 system, planet e stands…
JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum
Dana R. Louie, Elijah Mullens, Lili Alderson +27
Water has proven to be ubiquitously detected in near-infrared (NIR) transmission spectroscopy observations of hot Jupiter atmospheres, including WASP-17b. However, previous analyse…
Two Earth-size Planets and an Earth-size Candidate Transiting the Nearby Star HD 101581
Michelle Kunimoto, Zifan Lin, Sarah Millholland +43
We report the validation of multiple planets transiting the nearby ( pc) K5V dwarf HD 101581 (GJ 435, TOI-6276, TIC 397362481). The system consists of at least two Earth-…
JWST-TST DREAMS: A Super-Solar Metallicity in WASP-17 b Dayside Atmosphere from NIRISS SOSS Eclipse Spectroscopy
Amélie Gressier, Ryan J. MacDonald, Néstor Espinoza +26
We present the first emission spectrum of the hot Jupiter WASP-17 b using one eclipse observation from the JWST Near Infrared Imager and Slitless Spectrograph (NIRISS) Single Objec…
JWST-TST DREAMS: Non-Uniform Dayside Emission for WASP-17b from MIRI/LRS
Daniel Valentine, Hannah R. Wakeford, Ryan C. Challener +23
We present the first spectroscopic characterisation of the dayside atmosphere of WASP-17b in the mid-infrared using a single JWST MIRI/LRS eclipse observation. From forward-model f…
GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc
Evan Tey, Avi Shporer, Zifan Lin +30
We report the discovery of the transiting planet GJ 238 b, with a radius of R ( times the radius of Mars) and an orbital period of 1.74 da…
Behind the Mask: can HARMONI@ELT detect biosignatures in the reflected light of Proxima b?
Sophia R. Vaughan, Jayne L. Birkby, Niranjan Thatte +7
Proxima b is a rocky exoplanet in the habitable zone of the nearest star system and a key test case in the search for extraterrestrial life. Here, we investigate the characterizati…
JWST-TST DREAMS: Quartz Clouds in the Atmosphere of WASP-17b
David Grant, Nikole K. Lewis, Hannah R. Wakeford +39
Clouds are prevalent in many of the exoplanet atmospheres that have been observed to date. For transiting exoplanets, we know if clouds are present because they mute spectral featu…
JWST-TST Proper Motions: I. High-Precision NIRISS Calibration and Large Magellanic Cloud Kinematics
M. Libralato, A. Bellini, R. P. van der Marel +27
We develop and disseminate effective point-spread functions and geometric-distortion solutions for high-precision astrometry and photometry with the JWST NIRISS instrument. We corr…
TOI-1075 b: A Dense, Massive, Ultra-Short Period Hot Super-Earth Straddling the Radius Gap
Zahra Essack, Avi Shporer, Jennifer A. Burt +29
Populating the exoplanet mass-radius diagram in order to identify the underlying relationship that governs planet composition is driving an interdisciplinary effort within the exop…
High-Resolution spectral models of TRAPPIST-1e seen as a Pale Blue Dot for ELT and JWST observations
Zifan Lin, Lisa Kaltenegger
Rocky exoplanets orbiting in the habitable zone (HZ) of nearby M dwarfs provide unique opportunities for characterizing their atmospheres and searching for biosignature gases. TRAP…
H-dominated Atmosphere as an Indicator of Second-generation Rocky White Dwarf Exoplanets
Zifan Lin, Sara Seager, Sukrit Ranjan +2
Following the discovery of the first exoplanet candidate transiting a white dwarf (WD), a "white dwarf opportunity" for characterizing the atmospheres of terrestrial exoplanets aro…
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…
Differentiating Modern and Prebiotic Earth Scenarios for TRAPPIST-1e: High-resolution Transmission Spectra and Predictions for JWST
Zifan Lin, Ryan J. MacDonald, Lisa Kaltenegger +1
The TRAPPIST-1 system is a priority target for terrestrial exoplanet characterization. TRAPPIST-1e, residing in the habitable zone, will be observed during the JWST GTO Program. He…
Finding Signs of Life in Transit: High-resolution Transmission Spectra of Earth-like Planets around FGKM Host Stars
Lisa Kaltenegger, Zifan Lin
Thousands of transiting exoplanets have already been detected orbiting a wide range of host stars, including the first planets that could potentially be similar to Earth. The upcom…
Finding Signs of Life on Earth-like Planets: High-resolution Transmission Spectra of Earth through time around FGKM stars
L. Kaltenegger, Z. Lin, S. Rugheimer
The search for life in the universe mainly uses modern Earth as a template. However, we know that Earth's atmospheric composition changed significantly through its geological evolu…
High-resolution Spectra and Biosignatures of Earth-like Planets Transiting White Dwarfs
Thea Kozakis, Zifan Lin, Lisa Kaltenegger
With the first observations of debris disks as well as proposed planets around white dwarfs, the question of how rocky planets around such stellar remnants can be characterized and…