Jonathan Irwin
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View article: HD 35843: A Sun-like Star Hosting a Long-period Sub-Neptune and Inner Super-Earth
HD 35843: A Sun-like Star Hosting a Long-period Sub-Neptune and Inner Super-Earth Open
We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital period of 46.96 days that was first identified by Pl…
View article: The VMC survey
The VMC survey Open
Context. The near-infrared YJK s Visual and Infrared Survey Telescope for Astronomy (VISTA) survey of the Magellanic Clouds (VMC) is complete, along with data from additional programmes contributing to the enhancement of its quality over t…
View article: A transiting rocky super-Earth and a non-transiting sub-Neptune orbiting the M dwarf TOI-771
A transiting rocky super-Earth and a non-transiting sub-Neptune orbiting the M dwarf TOI-771 Open
Context. The origin and evolution of the sub-Neptune population is a highly debated topic in the exoplanet community. With the advent of JWST , atmospheric studies can now put unprecedented constraints on the internal composition of this p…
View article: HD 35843: A Sun-like star hosting a long period sub-Neptune and inner super-Earth
HD 35843: A Sun-like star hosting a long period sub-Neptune and inner super-Earth Open
We report the discovery and confirmation of two planets orbiting the metal-poor Sun-like star, HD 35843 (TOI 4189). HD 35843 c is a temperate sub-Neptune transiting planet with an orbital period of 46.96 days that was first identified by P…
View article: CETRA: a fast, sensitive exoplanet transit detection algorithm implemented for GPUs
CETRA: a fast, sensitive exoplanet transit detection algorithm implemented for GPUs Open
We present the Cambridge Exoplanet Transit Recovery Algorithm (cetra), a fast and sensitive transit detection algorithm, optimized for GPUs. cetra separates the task into a search for transit signals across linear time space, followed by a…
View article: CETRA: A fast, sensitive exoplanet transit detection algorithm implemented for GPUs
CETRA: A fast, sensitive exoplanet transit detection algorithm implemented for GPUs Open
We present the Cambridge Exoplanet Transit Recovery Algorithm (CETRA), a fast and sensitive transit detection algorithm, optimised for GPUs. CETRA separates the task into a search for transit signals across linear time space, followed by a…
View article: Hazy with a Chance of Star Spots: Constraining the Atmosphere of Young Planet K2-33b
Hazy with a Chance of Star Spots: Constraining the Atmosphere of Young Planet K2-33b Open
Although all-sky surveys have led to the discovery of dozens of young planets, little is known about their atmospheres. Here, we present multiwavelength transit data for the super-Neptune sized exoplanet, K2-33b-the youngest (~10 Myr) tran…
View article: LHS 475 b: A Potential Venus Analog Orbiting a Nearby M Dwarf
LHS 475 b: A Potential Venus Analog Orbiting a Nearby M Dwarf Open
Based on photometric observations by TESS, we present the discovery of a potential Venus analog transiting LHS 475, an M3 dwarf located 12.5 pc from the Sun. The mass of the star is 0.274 ± 0.015 M ☉ . The planet, originally reported as TO…
View article: TOI-481 b and TOI-892 b: Two Long-period Hot Jupiters from the Transiting Exoplanet Survey Satellite
TOI-481 b and TOI-892 b: Two Long-period Hot Jupiters from the Transiting Exoplanet Survey Satellite Open
We present the discovery of two new 10 day period giant planets from the Transiting Exoplanet Survey Satellite mission, whose masses were precisely determined using a wide diversity of ground-based facilities. TOI-481 b and TOI-892 b have …
View article: Zodiacal Exoplanets in Time (ZEIT). IX. A Flat Transmission Spectrum and a Highly Eccentric Orbit for the Young Neptune K2-25b as Revealed by Spitzer
Zodiacal Exoplanets in Time (ZEIT). IX. A Flat Transmission Spectrum and a Highly Eccentric Orbit for the Young Neptune K2-25b as Revealed by Spitzer Open
Transiting planets in nearby young clusters offer the opportunity to study the atmospheres and dynamics of planets during their formative years. To this end, we focused on K2-25b - a close-in (P = 3.48 days), Neptune-sized exoplanet orbiti…
View article: ZODIACAL EXOPLANETS in TIME (ZEIT). III. A SHORT-PERIOD PLANET ORBITING A PRE-MAIN-SEQUENCE STAR in the UPPER SCORPIUS OB ASSOCIATION
ZODIACAL EXOPLANETS in TIME (ZEIT). III. A SHORT-PERIOD PLANET ORBITING A PRE-MAIN-SEQUENCE STAR in the UPPER SCORPIUS OB ASSOCIATION Open
We confirm and characterize a close-in (Porb = 5.425 days), super-Neptune sized (5.04-0.37 +0.34 R⊕) planet transiting K2-33 (2MASS J16101473-1919095), a late-type (M3) pre-main-sequence (11 Myr old) star in the Upper Scorpius subgroup of …
View article: The Young Planetary System K2-25: Constraints on Companions and Starspots
The Young Planetary System K2-25: Constraints on Companions and Starspots Open
The abundance of planets with orbital periods of a few to tens of days suggests that exoplanets experience complex dynamical histories. Planets in young stellar clusters or associations have well-constrained ages and therefore provide an o…
View article: Exoplanet characterization by proxy: A transiting 2.15 R⊕ planet near the habitable zone of the late k dwarf kepler-61
Exoplanet characterization by proxy: A transiting 2.15 R⊕ planet near the habitable zone of the late k dwarf kepler-61 Open
We present the validation and characterization of Kepler-61b: a 2.15 R ⊕ planet orbiting near the inner edge of the habitable zone of a low-mass star. Our characterization of the host star Kepler-61 is based upon a comparison with a set of…
View article: A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776
A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776 Open
We report the discovery and characterization of two transiting planets around the bright M1 V star LP 961-53 (TOI-776, J = 8.5 mag, M = 0.54 ± 0.03 M⊙) detected during Sector 10 observations of the Transiting Exoplanet Survey Satellite (TE…
View article: The LHS 1678 System: Two Earth-sized Transiting Planets and an Astrometric Companion Orbiting an M Dwarf Near the Convective Boundary at 20 pc
The LHS 1678 System: Two Earth-sized Transiting Planets and an Astrometric Companion Orbiting an M Dwarf Near the Convective Boundary at 20 pc Open
We present the Transiting Exoplanet Survey Satellite (TESS) discovery of the LHS 1678 (TOI-696) exoplanet system, comprised of two approximately Earth-sized transiting planets and a likely astrometric brown dwarf orbiting a bright (V J = 1…
View article: The L 98-59 System: Three Transiting, Terrestrial-size Planets Orbiting a Nearby M Dwarf
The L 98-59 System: Three Transiting, Terrestrial-size Planets Orbiting a Nearby M Dwarf Open
We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three terrestrial-size planets transiting L 98-59 (TOI-175, TIC 307210830) - a bright M dwarf at a distance of 10.6 pc. Using the Gaia-measured distance and broadband …
View article: Active Stars in the Spectroscopic Survey of Mid-to-late M Dwarfs within 15 pc
Active Stars in the Spectroscopic Survey of Mid-to-late M Dwarfs within 15 pc Open
We present results from the volume-complete spectroscopic survey of 0.1–0.3 M ⊙ M dwarfs within 15 pc. This work discusses the active sample without close binary companions, providing a comprehensive picture of these 123 stars with H α emi…
View article: Mid-to-late M Dwarfs Lack Jupiter Analogs
Mid-to-late M Dwarfs Lack Jupiter Analogs Open
Cold Jovian planets play an important role in sculpting the dynamical environment in which inner terrestrial planets form. The core accretion model predicts that giant planets cannot form around low-mass M dwarfs, although this idea has be…
View article: Active Stars in the Spectroscopic Survey of Mid-to-Late M Dwarfs Within 15pc
Active Stars in the Spectroscopic Survey of Mid-to-Late M Dwarfs Within 15pc Open
We present results from the volume-complete spectroscopic survey of 0.1-0.3M$_\odot$ M dwarfs within 15pc. This work discusses the active sample without close binary companions, providing a comprehensive picture of these 123 stars with H$α…
View article: Mid-to-Late M Dwarfs Lack Jupiter Analogs
Mid-to-Late M Dwarfs Lack Jupiter Analogs Open
Cold Jovian planets play an important role in sculpting the dynamical environment in which inner terrestrial planets form. The core accretion model predicts that giant planets cannot form around low-mass M dwarfs, although this idea has be…
View article: LHS 475 b: A Venus-sized Planet Orbiting a Nearby M Dwarf
LHS 475 b: A Venus-sized Planet Orbiting a Nearby M Dwarf Open
Based on photometric observations by TESS, we present the discovery of a Venus-sized planet transiting LHS 475, an M3 dwarf located 12.5 pc from the Sun. The mass of the star is $0.274 \pm 0.015~\rm{M_{Sun}}$. The planet, originally report…
View article: TOI-3235 b: A Transiting Giant Planet around an M4 Dwarf Star
TOI-3235 b: A Transiting Giant Planet around an M4 Dwarf Star Open
We present the discovery of TOI-3235 b, a short-period Jupiter orbiting an M dwarf with a stellar mass close to the critical mass at which stars transition from partially to fully convective. TOI-3235 b was first identified as a candidate …
View article: TOI-3235 b: a transiting giant planet around an M4 dwarf star
TOI-3235 b: a transiting giant planet around an M4 dwarf star Open
We present the discovery of TOI-3235 b, a short-period Jupiter orbiting an M-dwarf with a stellar mass close to the critical mass at which stars transition from partially to fully convective. TOI-3235 b was first identified as a candidate …
View article: TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf
TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf Open
We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright (T = 8.5 mag), high proper motion (∼200 mas yr−1), low metallicity ([Fe/H]≈−0.28) K-dwarf with …
View article: TOI-1075 b: A Dense, Massive, Ultra-short-period Hot Super-Earth Straddling the Radius Gap
TOI-1075 b: A Dense, Massive, Ultra-short-period Hot Super-Earth Straddling the Radius Gap Open
Populating the exoplanet mass–radius diagram in order to identify the underlying relationship that governs planet composition is driving an interdisciplinary effort within the exoplanet community. The discovery of hot super-Earths—a high-t…
View article: Hazy with a Chance of Star Spots: Constraining the Atmosphere of Young Planet K2-33b
Hazy with a Chance of Star Spots: Constraining the Atmosphere of Young Planet K2-33b Open
Although all-sky surveys have led to the discovery of dozens of young planets, little is known about their atmospheres. Here, we present multiwavelength transit data for the super-Neptune sized exoplanet, K2-33b—the youngest (∼10 Myr) tran…
View article: LHS 1815b: The First Thick-disk Planet Detected by TESS
LHS 1815b: The First Thick-disk Planet Detected by TESS Open
We report the first discovery of a thick-disk planet, LHS 1815b (TOI-704b, TIC 260004324), detected in the Transiting Exoplanet Survey Satellite (TESS) survey. LHS 1815b transits a bright (V = 12.19 mag, K = 7.99 mag) and quiet M dwarf loc…
View article: Hazy with a chance of star spots: constraining the atmosphere of the young planet, K2-33b
Hazy with a chance of star spots: constraining the atmosphere of the young planet, K2-33b Open
Although all-sky surveys have led to the discovery of dozens of young planets, little is known about their atmospheres. Here, we present multi-wavelength transit data for the super Neptune-sized exoplanet, K2-33b -- the youngest (~10 Myr) …
View article: TOI-969: a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter
TOI-969: a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter Open
Context. The current architecture of a given multi-planetary system is a key fingerprint of its past formation and dynamical evolution history. Long-term follow-up observations are key to complete their picture. Aims. In this paper, we foc…