Jerome de Leon
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View article: Multiband, Multiepoch Photometry of the Spot-crossing System TOI-3884: Refined System Geometry and Spot Properties
Multiband, Multiepoch Photometry of the Spot-crossing System TOI-3884: Refined System Geometry and Spot Properties Open
Spot-crossing transits offer a unique opportunity to probe spot properties such as temperature, size, and surface distribution. TOI-3884 is a rare system in which spot-crossing features are persistently observed during every transit. This …
View article: The TESS Grand Unified Hot Jupiter Survey. III. Thirty More Giant Planets<sup>*</sup>
The TESS Grand Unified Hot Jupiter Survey. III. Thirty More Giant Planets<sup>*</sup> Open
We present the discovery of 30 transiting giant planets that were initially detected using data from NASA’s Transiting Exoplanet Survey Satellite mission. These new planets orbit relatively bright ( G ≤ 12.5) FGK host stars with orbital pe…
View article: Validation of TESS Planet Candidates with Multicolor Transit Photometry and <tt>TRICERATOPS+</tt>
Validation of TESS Planet Candidates with Multicolor Transit Photometry and TRICERATOPS+ Open
We present an upgraded version of TRICERATOPS , a software package designed to calculate false positive probabilities for planet candidates identified by the Transiting Exoplanet Survey Satellite (TESS). This enhanced framework now incorpo…
View article: The mass of TOI-654 b: A short-period sub-Neptune transiting a mid-M dwarf
The mass of TOI-654 b: A short-period sub-Neptune transiting a mid-M dwarf Open
Sub-Neptunes are small planets between the size of the Earth and Neptune. The orbital and bulk properties of transiting sub-Neptunes can provide clues for their formation and evolution of small planets. In this paper, we report on follow-u…
View article: The mass of TOI-654 b: A short-period sub-Neptune transiting a mid-M dwarf
The mass of TOI-654 b: A short-period sub-Neptune transiting a mid-M dwarf Open
Sub-Neptunes are small planets between the size of the Earth and Neptune. The orbital and bulk properties of transiting sub-Neptunes can provide clues for their formation and evolution of small planets. In this paper, we report on follow-u…
View article: Discovery of a transiting hot water-world candidate orbiting Ross 176 with TESS and CARMENES
Discovery of a transiting hot water-world candidate orbiting Ross 176 with TESS and CARMENES Open
The Transiting Exoplanet Survey Satellite ( TESS ) discovered several new planet candidates that need to be confirmed and characterized with ground-based observations. This is the case of Ross 176, a late K-type star that hosts a promising…
View article: Eleven New Transiting Brown Dwarfs and Very-low-mass Stars from TESS
Eleven New Transiting Brown Dwarfs and Very-low-mass Stars from TESS Open
We present the discovery of 11 new transiting brown dwarfs (BDs) and low-mass M dwarfs from NASA’s Transiting Exoplanet Survey Satellite (TESS) mission: TOI-2844, TOI-3122, TOI-3577, TOI-3755, TOI-4462, TOI-4635, TOI-4737, TOI-4759, TOI-52…
View article: TOI-1846 b: a super-Earth in the radius valley orbiting a nearby M dwarf
TOI-1846 b: a super-Earth in the radius valley orbiting a nearby M dwarf Open
We present the discovery and validation of a super-Earth planet orbiting the M dwarf star TOI-1846 (TIC 198385543). The host star ($K_{\rm mag} = 9.6$) is located 47 pc away and has a radius of $R_\star = 0.41 \pm 0.01$$\rm \, R_\odot$, a …
View article: The eccentricity distribution of warm sub-Saturns in <i>TESS</i>
The eccentricity distribution of warm sub-Saturns in <i>TESS</i> Open
We present the eccentricity distribution of warm sub-Saturns (4–8 $R_{\rm{\oplus }}$, 8–200 d periods) as derived from an analysis of transit light curves from NASA’s Transiting Exoplanet Survey Satellite (TESS) mission. We use the ‘photoe…
View article: The Eccentricity Distribution of Warm Sub-Saturns in TESS
The Eccentricity Distribution of Warm Sub-Saturns in TESS Open
We present the eccentricity distribution of warm sub-Saturns (4-8 Re, 8-200 day periods) as derived from an analysis of transit light curves from NASA's Transiting Exoplanet Survey Satellite (TESS) mission. We use the "photoeccentric" effe…
View article: Tidally Heated Sub-Neptunes, Refined Planetary Compositions, and Confirmation of a Third Planet in the TOI-1266 System
Tidally Heated Sub-Neptunes, Refined Planetary Compositions, and Confirmation of a Third Planet in the TOI-1266 System Open
TOI-1266 is a benchmark system of two temperate ( ), and combine the TTVs with archival radial velocity measurements to improve our knowledge of the planetary masses and radii. We find that, consistent with previous studies, TOI-12…
View article: TOI-2015 b: A sub-Neptune in strong gravitational interaction with an outer non-transiting planet
TOI-2015 b: A sub-Neptune in strong gravitational interaction with an outer non-transiting planet Open
TOI-2015 is a known exoplanetary system around an M4 dwarf star, consisting of a transiting sub-Neptune planet in a 3.35-day orbital period, TOI-2015 b, accompanied by a non-transiting companion, TOI-2015 c. High-precision radial-velocity …
View article: TOI-2015b: a sub-Neptune in strong gravitational interaction with an outer non-transiting planet
TOI-2015b: a sub-Neptune in strong gravitational interaction with an outer non-transiting planet Open
TOI-2015 is a known exoplanetary system around an M4 dwarf star, consisting of a transiting sub-Neptune planet in a 3.35-day orbital period, TOI-2015b, accompanied by a non-transiting companion, TOI-2015c. High-precision RV measurements we…
View article: Confirmation of four hot Jupiters detected by TESS using follow-up spectroscopy from MaHPS at Wendelstein together with NEID and TRES
Confirmation of four hot Jupiters detected by TESS using follow-up spectroscopy from MaHPS at Wendelstein together with NEID and TRES Open
We report the confirmation and characterization of four hot Jupiter-type exoplanets initially detected by TESS: TOI-1295 b, TOI-2580 b, TOI-6016 b, and TOI-6130 b. Using observations with the high-resolution echelle spectrograph MaHPS on t…
View article: A Fourth Planet in the Kepler-51 System Revealed by Transit Timing Variations
A Fourth Planet in the Kepler-51 System Revealed by Transit Timing Variations Open
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…
View article: Migration and Evolution of giant ExoPlanets (MEEP). I. Nine Newly Confirmed Hot Jupiters from the TESS Mission
Migration and Evolution of giant ExoPlanets (MEEP). I. Nine Newly Confirmed Hot Jupiters from the TESS Mission Open
Hot Jupiters were many of the first exoplanets discovered in the 1990s, but in the decades since their discovery the mysteries surrounding their origins have remained. Here we present nine new hot Jupiters (TOI-1855 b, TOI-2107 b, TOI-2368…
View article: Low abundances of TiO and VO on the dayside of KELT-9 b: Insights from ground-based photometric observations
Low abundances of TiO and VO on the dayside of KELT-9 b: Insights from ground-based photometric observations Open
We present ground-based photometric observations of secondary eclipses of the hottest known planet KELT-9 b using MuSCAT2 and Sinistro. We detect secondary eclipse signals in i and $z_{\rm s}$ with eclipse depths of $373^{+74}_{-75}$ and $…
View article: Validation of up to seven TESS planet candidates through multi-colour transit photometry using MuSCAT2 data
Validation of up to seven TESS planet candidates through multi-colour transit photometry using MuSCAT2 data Open
The TESS mission searches for transiting exoplanets by monitoring the brightness of hundreds of thousands of stars across the entire sky. M-type planet hosts are ideal targets for this mission due to their smaller size and cooler temperatu…
View article: Validation of up to seven TESS planet candidates through multi-colour transit photometry using MuSCAT2 data
Validation of up to seven TESS planet candidates through multi-colour transit photometry using MuSCAT2 data Open
The TESS mission searches for transiting exoplanets by monitoring the brightness of hundreds of thousands of stars across the entire sky. M-type planet hosts are ideal targets for this mission due to their smaller size and cooler temperatu…
View article: The MOPYS project: A survey of 70 planets in search of extended He I and H atmospheres
The MOPYS project: A survey of 70 planets in search of extended He I and H atmospheres Open
During the first billion years of their life, exoplanet atmospheres are modified by different atmospheric escape phenomena that can strongly affect the shape and morphology of the exoplanet itself. These processes can be studied with Ly α …
View article: Migration and Evolution of giant ExoPlanets (MEEP). I. Nine Newly Confirmed Hot Jupiters from the TESS Mission
Migration and Evolution of giant ExoPlanets (MEEP). I. Nine Newly Confirmed Hot Jupiters from the TESS Mission Open
Hot Jupiters were many of the first exoplanets discovered in the 1990s, but in the decades since their discovery the mysteries surrounding their origins have remained. Here we present nine new hot Jupiters (TOI-1855 b, TOI-2107 b, TOI-2368…
View article: The Discovery and Follow-up of Four Transiting Short-period Sub-Neptunes Orbiting M Dwarfs
The Discovery and Follow-up of Four Transiting Short-period Sub-Neptunes Orbiting M Dwarfs Open
Sub-Neptunes with radii of 2–3 R ⊕ are intermediate in size between rocky planets and Neptune-sized planets. The orbital properties and bulk compositions of transiting sub-Neptunes provide clues to the formation and evolution of close-in s…
View article: Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy
Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy Open
Recent discoveries of Earth-sized planets transiting nearby M dwarfs have made it possible to characterize the atmospheres of terrestrial planets via follow-up spectroscopic observations. However, the number of such planets receiving low i…
View article: Three short-period Earth-sized planets around M dwarfs discovered by TESS: TOI-5720 b, TOI-6008 b, and TOI-6086 b
Three short-period Earth-sized planets around M dwarfs discovered by TESS: TOI-5720 b, TOI-6008 b, and TOI-6086 b Open
One of the main goals of the NASA Transiting Exoplanet Survey Satellite (TESS) mission is the discovery of Earth-like planets around nearby M-dwarf stars. We present the discovery and validation of three new short-period Earth-sized planet…
View article: Identification of the Top TESS Objects of Interest for Atmospheric Characterization of Transiting Exoplanets with JWST
Identification of the Top TESS Objects of Interest for Atmospheric Characterization of Transiting Exoplanets with JWST Open
JWST has ushered in an era of unprecedented ability to characterize exoplanetary atmospheres. While there are over 5000 confirmed planets, more than 4000 Transiting Exoplanet Survey Satellite (TESS) planet candidates are still unconfirmed …
View article: Characterization of starspots on a young M-dwarf K2-25: multiband observations of stellar photometric variability and planetary transits
Characterization of starspots on a young M-dwarf K2-25: multiband observations of stellar photometric variability and planetary transits Open
Detailed atmospheric characterization of exoplanets by transmission spectroscopy requires careful consideration of stellar surface inhomogeneities induced by star-spots. This effect is particularly problematic for planetary systems around …
View article: Characterization of starspots on a young M-dwarf K2-25: multi-band observations of stellar photometric variability and planetary transits
Characterization of starspots on a young M-dwarf K2-25: multi-band observations of stellar photometric variability and planetary transits Open
Detailed atmospheric characterization of exoplanets by transmission spectroscopy requires careful consideration of stellar surface inhomogeneities induced by starspots. This effect is particularly problematic for planetary systems around M…