Explanipedia

JWST-TST DREAMS: Sulfur Dioxide in the Atmosphere of the Neptune-mass Planet HAT-P-26 b from NIRSpec G395H Transmission Spectroscopy Open

Amélie Gressier, Natasha E. Batalha, Nicholas F. Wogan, Lili Alderson, Dominic Doud , et al. · 2025

We present the James Webb Space Telescope (JWST) transmission spectrum of the exoplanet HAT-P-26 b (18.6 M ⊕ , 6.33 R ⊕ ), based on a single transit observed with the JWST NIRSpec G395H grating. We detect water vapor ( = 4.1), carbon di…

Reproduction package for the paper "Spectroscopic Characterization of LOFAR Radio-emitting M Stars" Open

Eunmo Koo, M. Delamer, Suvrath Mahadevan, J. R. Callingham, H. K. Vedantham , et al. · 2025

This is a basic data reproduction package for the paper "Spectroscopic Characterization of LOFAR Radio-emitting M Stars" by E. Koo. et al (2025). It aims to provide the most important data products to reproduce the main results of the pape…

Searching for GEMS: TOI-5916 b & TOI-6158 b are two Saturn-density planets orbiting M2 dwarfs Open

Sean O'Brien, Andre Wong, Te Han, Paul Robertson, Shubham Kanodia , et al. · 2025

We confirm the planetary nature of (1) TOI-5916 b and (2) TOI-6158 b, two Exoplanets Transiting M-dwarf Stars (GEMS), both discovered by the Transiting Exoplanet Survey Satellite (TESS). Both systems were confirmed with ground-based photom…

The NEID Earth Twin Survey. III. Survey Performance after Three Years on Sky Open

Arvind F. Gupta, Evan Fitzmaurice, Suvrath Mahadevan, Paul Robertson, Jacob K. Luhn , et al. · 2025

The NEID Earth Twin Survey (NETS) has been delivering a rich set of precise radial velocity (RV) measurements for 41 bright, nearby main-sequence stars. Here, we describe the status of the survey after 3 yr on sky, and we present the full …

Searching for GEMS: TOI-5349b is a Saturn-like planet orbiting a metal-rich early M-dwarf Open

Angeli Sandoval, Caleb I. Cañas, Knicole D. Colón, Alexander Larsen, Tera N. Swaby , et al. · 2025

We report the confirmation and analysis of TOI-5349b, a transiting, warm, Saturn-like planet orbiting an early M-dwarf with a period of $\sim$3.3 days, which we confirmed as part of the Searching for GEMS (Giant Exoplanets around M-dwarf S…

JWST-TST DREAMS: Sulfur dioxide in the atmosphere of the Neptune-mass planet HAT-P-26 b from NIRSpec G395H transmission spectroscopy Open

Amélie Gressier, Natasha E. Batalha, Nicholas F. Wogan, Lili Alderson, Dominic Doud , et al. · 2025

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 the JWST NIRSpec G395H grating. We detect water vapor (ln B =…

Searching for GEMS: The Occurrence of Giant Planets orbiting M-dwarfs within 100 pc Open

Rowen Glusman, Caleb I. Cañas, Shubham Kanodia, Te Han, Rachel B. Fernandes , et al. · 2025

We present results from a systematic search for transiting short-period Giant Exoplanets around M-dwarf Stars (GEMS; $P < 10$ days, $R_p \gtrsim 8~R_\oplus$) within a distance-limited 100\,pc sample of 149,316 M-dwarfs using TESS-Gaia Ligh…

JWST-TST DREAMS: NIRSpec/PRISM Transmission Spectroscopy of the Habitable Zone Planet TRAPPIST-1 e Open

Néstor Espinoza, Natalie H. Allen, Ana Glidden, Nikole K. Lewis, Sara Seager , et al. · 2025

TRAPPIST-1 e is one of the very few rocky exoplanets that is both amenable to atmospheric characterization and resides in the habitable zone of its star—located at a distance from its star such that it might, with the right atmosphere, sus…

JWST-TST DREAMS: Secondary Atmosphere Constraints for the Habitable Zone Planet TRAPPIST-1 e Open

Ana Glidden, Sukrit Ranjan, Sara Seager, Néstor Espinoza, Ryan J. MacDonald , et al. · 2025

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 out as highly likely to sustain surface liquid water if it …

Searching for GEMS: TOI-7149 b, an Inflated Giant Planet Causing a 12% Transit of a Fully Convective M-dwarf Open

Shubham Kanodia, Caleb I. Cañas, Suvrath Mahadevan, Andrea S. J. Lin, Henry A. Kobulnicky , et al. · 2025

We describe the discovery and characterization of TOI-7149 b, a 0.705 ± 0.075 M J , 1.18 ± 0.045 R J gas giant on a ∼2.65 days period orbit transiting an M4V star with a mass of 0.344 ± 0.030 M ⊙ and an effective temperature of 3363 ± 59 K…

Hundreds of TESS Exoplanets Might Be Larger than We Thought Open

Te Han, Paul Robertson, Timothy D. Brandt, Shubham Kanodia, Caleb I. Cañas , et al. · 2025

The radius of a planet is a fundamental parameter that probes its composition and habitability. Precise radius measurements are typically derived from the fraction of starlight blocked when a planet transits its host star. The wide-field T…

The NEID Earth Twin Survey. III. Survey Performance After Three Years on Sky Open

Arvind F. Gupta, Jacob K. Luhn, Sarah E. Logsdon, Leonardo A. Paredes, Chad F. Bender , et al. · 2025

The NEID Earth Twin Survey (NETS) has been delivering a rich set of precise radial velocity (RV) measurements for 41 bright, nearby main sequence stars. Here, we describe the status of the survey after three years on sky and we present the…

Searching for GEMS: Confirmation of TOI-5573 b, a Cool, Saturn-like Planet Orbiting an M Dwarf<sup>*</sup> Open

Rachel B. Fernandes, Shubham Kanodia, Megan Delamer, Andrew Hotnisky, Te Han , et al. · 2025

We present the confirmation of TOI-5573 b, a Saturn-sized exoplanet on an 8.79 days orbit around an early M dwarf (3790 K, 0.59 R ⊙ , 0.61 M ⊙ , 12.30 Jmag). TOI-5573 b has a mass of M ⊕ (0.35 ± 0.06 M Jup ) and a radius of 9.75…

Searching for GEMS: Two Super-Jupiters Around M Dwarfs that May have Formed via Gravitational Instability Open

Andrew Hotnisky, Shubham Kanodia, Jessica E. Libby-Roberts, Suvrath Mahadevan, Caleb I. Cañas , et al. · 2025

We present the discovery of TOI-6303b and TOI-6330b, two massive transiting super-Jupiters orbiting a M0 and a M2 dwarf star, respectively, as part of the Searching for Giant Exoplanets around M-dwarf Stars (GEMS) survey. These were detect…

The James Webb Space Telescope NIRSpec-PRISM Transmission Spectrum of the Super-Puff, Kepler-51d Open

Jessica E. Libby-Roberts, Aaron Bello-Arufe, Zachory K. Berta-Thompson, Caleb I. Cañas, Yayaati Chachan , et al. · 2025

Kepler-51 is a 500 Myr G dwarf hosting three "super-puffs" and one low-mass non-transiting planet. Kepler-51d, the coolest (T_eq ~ 350 K) transiting planet in this system, is also one of the lowest density super-puffs known to date (rho_p …

Searching for GEMS: Confirmation of TOI-5573b, a Cool, Saturn-like Planet Orbiting An M-dwarf Open

Rachel B. Fernandes, Shubham Kanodia, Megan Delamer, Andrew Hotnisky, Te Han , et al. · 2025

We present the confirmation of TOI-5573b, a Saturn-sized exoplanet on an 8.79-day orbit around an early M-dwarf (3790 K, 0.59 R$\odot$, 0.61 M$\odot$, 12.30 J mag). TOI-5573b has a mass of $112^{+18}_{-19}$ M$\oplus$ (0.35$\pm$0.06 M$\math…

Searching for GEMS: Discovery and Characterization of Two Brown Dwarfs Around M Dwarfs* Open

Alexander Larsen, Tera N. Swaby, Henry A. Kobulnicky, Caleb I. Cañas, Shubham Kanodia , et al. · 2025

Brown dwarfs bridge the gap between stars and planets, providing valuable insight into both planetary and stellar-formation mechanisms. Yet the census of transiting brown-dwarf companions, in particular around M-dwarf stars, remains incomp…

NEIDSpecMatch: Stellar Parameter Estimation with NEID Spectra Using an Empirical Library Open

Te Han, Paul Robertson, Caleb I. Cañas, Guđmundur Stefánsson, Shubham Kanodia , et al. · 2025

We introduce NEIDSpecMatch , a tool developed to extract stellar parameters from spectra obtained with the NEID spectrograph. NEIDSpecMatch is based on SpecMatch-Emp and HPFSpecMatch , which estimate stellar parameters by comparing the obs…

Searching for GEMS: TOI-5688 A b, a Low-density Giant Orbiting a High-metallicity Early M-dwarf* Open

Varghese Reji, Shubham Kanodia, Joe P. Ninan, Caleb I. Cañas, Jessica E. Libby-Roberts , et al. · 2025

We present the discovery of a low-density planet orbiting the high-metallicity early M-dwarf TOI-5688 A b. This planet was characterized as part of the search for transiting giant planets ( R ≳ 8 R ⊕ ) through the Searching for Giant Exopl…

GEMS JWST: Transmission spectroscopy of TOI-5205b reveals significant stellar contamination and a metal-poor atmosphere Open

Caleb I. Cañas, Jacob Lustig‐Yaeger, Shang‐Min Tsai, Simon Müller, Ravit Helled , et al. · 2025

Recent discoveries of transiting giant exoplanets around M dwarfs (GEMS) present an opportunity to investigate their atmospheric compositions and explore how such massive planets can form around low-mass stars contrary to canonical formati…

Gaia-4b and 5b: Radial Velocity Confirmation of Gaia Astrometric Orbital Solutions Reveal a Massive Planet and a Brown Dwarf Orbiting Low-mass Stars Open

Guðmundur Stefánsson, Suvrath Mahadevan, Joshua N. Winn, Marcus L. Marcussen, Shubham Kanodia , et al. · 2025

Gaia astrometry of nearby stars is precise enough to detect the tiny displacements induced by substellar companions, but radial velocity (RV) data are needed for definitive confirmation. Here we present RV follow-up observations of 28 M an…

Searching for GEMS: Discovery and Characterization of Two Brown Dwarfs Around M Dwarfs Open

Alexander Larsen, Tera N. Swaby, Henry A. Kobulnicky, Caleb I. Cañas, Shubham Kanodia , et al. · 2025

Brown dwarfs bridge the gap between stars and planets, providing valuable insight into both planetary and stellar formation mechanisms. Yet the census of transiting brown dwarf companions, in particular around M dwarf stars, remains incomp…

JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum Open

Dana R. Louie, Elijah Mullens, Lili Alderson, Ana Glidden, Nikole K. Lewis , et al. · 2025

Water has proven to be ubiquitously detected in near-infrared (NIR) transmission spectroscopy observations of hot Jupiter atmospheres, including WASP-17b. However, previous analyses of WASP-17b’s atmosphere based upon Hubble Space Telescop…

JWST-TST DREAMS: A Supersolar Metallicity in WASP-17 b’s Dayside Atmosphere from NIRISS SOSS Eclipse Spectroscopy Open

Amélie Gressier, Ryan J. MacDonald, Néstor Espinoza, Hannah R. Wakeford, Nikole K. Lewis , et al. · 2025

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 Object Slitless Spectroscopy (SOSS) mode. Covering a wavelength …

The First Spin-Orbit Obliquity of an M dwarf/brown dwarf system: an eccentric and aligned TOI-2119 b Open

Lauren Doyle, Caleb I. Cañas, Jessica E. Libby-Roberts, H. M. Cegla, Gumundur Stefánsson , et al. · 2024

We report the first instance of an M dwarf/brown dwarf obliquity measurement for the TOI-2119 system using the Rossiter–McLaughlin effect. TOI-2119 b is a transiting brown dwarf orbiting a young, active early M dwarf ($T_{\rm {eff}}$ = 355…

JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum Open

Dana R. Louie, Elijah Mullens, Lili Alderson, Ana Glidden, Nikole K. Lewis , et al. · 2024

Water has proven to be ubiquitously detected in near-infrared (NIR) transmission spectroscopy observations of hot Jupiter atmospheres, including WASP-17b. However, previous analyses of WASP-17b's atmosphere based upon Hubble Space Telescop…

The NEID Earth Twin Survey. I. Confirmation of a 31 Day Planet Orbiting HD 86728 Open

Arvind F. Gupta, Jacob K. Luhn, Jason T. Wright, Suvrath Mahadevan, Paul Robertson , et al. · 2024

With close to 3 yr of observations in hand, the NEID Earth Twin Survey (NETS) is starting to unearth new astrophysical signals for a curated sample of bright, radial velocity (RV)-quiet stars. We present the discovery of the first NETS exo…

A Fourth Planet in the Kepler-51 System Revealed by Transit Timing Variations Open

K. Masuda, Jessica E. Libby-Roberts, John H. Livingston, Kevin B. Stevenson, Peter Gao , et al. · 2024

Kepler-51 is a ≲1 Gyr old Sun-like star hosting three transiting planets with radii ≈6–9 R ⊕ and orbital periods ≈45–130 days. Transit timing variations (TTVs) measured with past Kepler and Hubble Space Telescope (HST) observations have be…

The First Spin-Orbit Obliquity of an M dwarf/brown dwarf System: An eccentric and aligned TOI-2119 b Open

Lauren Doyle, Caleb I. Cañas, Jessica E. Libby-Roberts, H. M. Cegla, Guđmundur Stefánsson , et al. · 2024

We report the first instance of an M dwarf/brown dwarf obliquity measurement for the TOI-2119 system using the Rossiter-McLaughlin effect. TOI-2119 b is a transiting brown dwarf orbiting a young, active early M dwarf ($T_{\rm{eff}}$ = 3553…

Searching for GEMS: TOI-6383Ab, a Giant Planet Transiting an M3-dwarf Star in a Binary System* Open

Lia Marta Bernabò, Shubham Kanodia, Caleb I. Cañas, William D. Cochran, Szilárd Csizmadia , et al. · 2024

We report on the discovery of a transiting giant planet around the 3500 K M3-dwarf star TOI-6383A located 172 pc from Earth. It was detected by the Transiting Exoplanet Survey Satellite and confirmed by a combination of ground-based follow…

Caleb I. Cañas YOU? Author Swipe