Jon Otegi
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View article: TOI-2447 b / NGTS-29 b: a 69-day Saturn around a Solar analogue
TOI-2447 b / NGTS-29 b: a 69-day Saturn around a Solar analogue Open
Discovering transiting exoplanets with relatively long orbital periods (>10 d) is crucial to facilitate the study of cool exoplanet atmospheres (Teq < 700 K) and to understand exoplanet formation and inward migration further out than…
View article: TOI-2447 b / NGTS-29 b: a 69-day Saturn around a Solar analogue
TOI-2447 b / NGTS-29 b: a 69-day Saturn around a Solar analogue Open
Discovering transiting exoplanets with relatively long orbital periods ($>$10 days) is crucial to facilitate the study of cool exoplanet atmospheres ($T_{\rm eq} < 700 K$) and to understand exoplanet formation and inward migration further …
View article: TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS
TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS Open
Context. A large sample of long-period giant planets has been discovered thanks to long-term radial velocity surveys, but only a few dozen of these planets have a precise radius measurement. Transiting gas giants are crucial targets for th…
View article: Spinning up a Daze: TESS Uncovers a Hot Jupiter Orbiting the Rapid Rotator TOI-778
Spinning up a Daze: TESS Uncovers a Hot Jupiter Orbiting the Rapid Rotator TOI-778 Open
NASA’s Transiting Exoplanet Survey Satellite (TESS) mission has been uncovering a growing number of exoplanets orbiting nearby, bright stars. Most exoplanets that have been discovered by TESS orbit narrow-line, slow-rotating stars, facilit…
View article: Spinning up a Daze: TESS Uncovers a Hot Jupiter orbiting the Rapid-Rotator TOI-778
Spinning up a Daze: TESS Uncovers a Hot Jupiter orbiting the Rapid-Rotator TOI-778 Open
NASA's Transiting Exoplanet Survey Satellite (TESS) mission, has been uncovering a growing number of exoplanets orbiting nearby, bright stars. Most exoplanets that have been discovered by TESS orbit narrow-line, slow-rotating stars, facili…
View article: GJ 3090 b: one of the most favourable mini-Neptune for atmospheric characterisation
GJ 3090 b: one of the most favourable mini-Neptune for atmospheric characterisation Open
We report the detection of GJ 3090 b (TOI-177.01), a mini-Neptune on a 2.9-day orbit transiting a bright ( K = 7.3 mag) M2 dwarf located at 22 pc. The planet was identified by the Transiting Exoplanet Survey Satellite and was confirmed wit…
View article: Forming iron-rich planets with giant impacts
Forming iron-rich planets with giant impacts Open
We investigate mantle stripping giant impacts (GI) between super-Earths with masses between 1 and $20\, {\rm M}_{\oplus }$. We infer new scaling laws for the mass of the largest fragment and its iron mass fraction, as well as updated fitti…
View article: Three new brown dwarfs and a massive hot Jupiter revealed by TESS around early-type stars
Three new brown dwarfs and a massive hot Jupiter revealed by TESS around early-type stars Open
Context. The detection and characterization of exoplanets and brown dwarfs around massive AF-type stars is essential to investigate and constrain the impact of stellar mass on planet properties. However, such targets are still poorly explo…
View article: The similarity of multi-planet systems
The similarity of multi-planet systems Open
Previous studies using Kepler data suggest that planets orbiting the same star tend to have similar sizes. However, due to the faintness of the stars, only a few of the planets were also detected with radial velocity follow-ups, and theref…
View article: The HD 137496 system: A dense, hot super-Mercury and a cold Jupiter
The HD 137496 system: A dense, hot super-Mercury and a cold Jupiter Open
Context. Most of the currently known planets are small worlds with radii between that of the Earth and that of Neptune. The characterization of planets in this regime shows a large diversity in compositions and system architectures, with d…
View article: TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert
TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert Open
© 2020. The American Astronomical Society. All rights reserved. We report the detection of a transiting hot Neptune exoplanet orbiting TOI-824 (SCR J1448-5735), a nearby (d = 64 pc) K4V star, using data from the Transiting Exoplanet Survey…
View article: TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet
TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet Open
© 2020. The American Astronomical Society. All rights reserved. The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here, we present the detection and mass measurement of a…
View article: TOI-431/HIP 26013: a super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet
TOI-431/HIP 26013: a super-Earth and a sub-Neptune transiting a bright, early K dwarf, with a third RV planet Open
We present the bright (Vmag = 9.12), multiplanet system TOI-431, characterized with photometry and radial velocities (RVs). We estimate the stellar rotation period to be 30.5 ± 0.7 d using archival photometry and RVs. Transiting Exoplanet …
View article: TOI-269 b: an eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA
TOI-269 b: an eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA Open
We present the confirmation of a new sub-Neptune close to the transition between super-Earths and sub-Neptunes transiting the M2 dwarf TOI-269 (TIC 220 479 565, V = 14.4 mag, J = 10.9 mag, R⋆ = 0.40 R⊙, M⋆ = 0.39 M⊙, d = 57 pc). The exopla…
View article: TOI-220 <i>b</i>: a warm sub-Neptune discovered by<i>TESS</i>
TOI-220 <i>b</i>: a warm sub-Neptune discovered by<i>TESS</i> Open
In this paper, we report the discovery of TOI-220 b, a new sub-Neptune detected by the Transiting Exoplanet Survey Satellite (TESS) and confirmed by radial velocity follow-up observations with the HARPS spectrograph. Based on the combined …
View article: A sub-Neptune and a non-transiting Neptune-mass companion unveiled by ESPRESSO around the bright late-F dwarf HD 5278 (TOI-130)
A sub-Neptune and a non-transiting Neptune-mass companion unveiled by ESPRESSO around the bright late-F dwarf HD 5278 (TOI-130) Open
Context. Transiting sub-Neptune-type planets, with radii approximately between 2 and 4 R ⊕ , are of particular interest as their study allows us to gain insight into the formation and evolution of a class of planets that are not found in o…
View article: Impact of the measured parameters of exoplanets on the inferred internal structure.
Impact of the measured parameters of exoplanets on the inferred internal structure. Open
<p>Exoplanet characterization is one of the main foci of current exoplanetary science. For super-Earths and sub-Neptunes, we mostly rely on mass and radius measurements, which allow us to derive the mean density of the body and give …
View article: A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113
A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113 Open
We report the discovery of HD 110113 b (TESS object of interest-755.01), a transiting mini-Neptune exoplanet on a 2.5-d orbit around the solar-analogue HD 110113 (Teff = 5730 K). Using TESS photometry and High Accuracy Radial velocity Plan…
View article: The impact of exoplanets' measured parameters on the inferred internal structure.
The impact of exoplanets' measured parameters on the inferred internal structure. Open
Exoplanet characterization is one of the main foci of current exoplanetary science. For super-Earths and sub-Neptunes, we mostly rely on mass and radius measurements, which allow to derive the body’s mean density and give a rough est…
View article: TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert
TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert Open
We report the detection of a transiting hot Neptune exoplanet orbiting TOI-824 ( SCR J1448-5735 ), a nearby ( d = 64 pc) K4V star, using data from the Transiting Exoplanet Survey Satellite. The newly discovered planet has a radius R p = 2.…
View article: Impact of the measured parameters of exoplanets on the inferred internal structure
Impact of the measured parameters of exoplanets on the inferred internal structure Open
Context. Exoplanet characterization is one of the main foci of current exoplanetary science. For super-Earths and sub-Neptunes, we mostly rely on mass and radius measurements, which allow us to derive the mean density of the body and give …
View article: Three short-period Jupiters from TESS
Three short-period Jupiters from TESS Open
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 an ultra-short-period Jupiter orbiting a bright (V = 11.1 …
View article: Revisited mass-radius relations for exoplanets below 120 M⊕
Revisited mass-radius relations for exoplanets below 120 M⊕ Open
The masses and radii of exoplanets are fundamental quantities needed for their characterisation. Studying the different populations of exoplanets is important for understanding the demographics of the different planetary types, which can t…
View article: Mass determinations of the three mini-Neptunes transiting TOI-125
Mass determinations of the three mini-Neptunes transiting TOI-125 Open
The Transiting Exoplanet Survey Satellite, TESS, is currently carrying out an all-sky search for small planets transiting bright stars. In the first year of the TESS survey, a steady progress was made in achieving the mission’s primary sci…