Showing 2021 · astro-ph.EPShow all

14 papers · 2 filters

astro-ph.EP2021★ 74 cited

GJ 367b: A dense ultra-short period sub-Earth planet transiting a nearby red dwarf star

Kristine W. F. Lam, Szilárd Csizmadia, Nicola Astudillo-Defru +75

Ultra-short-period (USP) exoplanets have orbital periods shorter than one day. Precise masses and radii of USPs could provide constraints on their unknown formation and evolution p…

astro-ph.EP2021

K2-99 revisited: a non-inflated warm Jupiter, and a temperate giant planet on a 522-d orbit around a subgiant

A. M. S. Smith, S. N. Breton, Sz. Csizmadia +29

We report new photometric and spectroscopic observations of the K2-99 planetary system. Asteroseismic analysis of the short-cadence light curve from K2's Campaign 17 allows us to r…

astro-ph.EP2021★ 3 cited

Inferring Shallow Surfaces on sub-Neptune Exoplanets with JWST

Shang-Min Tsai, Hamish Innes, Tim Lichtenberg +4

Planets smaller than Neptune and larger than Earth make up the majority of the discovered exoplanets. Those with H-rich atmospheres are prime targets for atmospheric characteri…

astro-ph.EP2021

Orbital alignment of HD 332231 b

E. Knudstrup, S. Albrecht

Contrary to the orthodox picture of planet formation resulting in a neatly ordered Solar System, exoplanet systems exhibit highly diverse orbits: short and long periods, circular a…

astro-ph.EP2021★ 27 cited

Probing the atmosphere of WASP-69 b with low- and high-resolution transmission spectroscopy

S. Khalafinejad, K. Molaverdikhani, J. Blecic +31

Consideration of both low- and high-resolution transmission spectroscopy is key for obtaining a comprehensive picture of exoplanet atmospheres. In studies of transmission spectra,…

astro-ph.EP2021

TOI-1518b: A Misaligned Ultra-hot Jupiter with Iron in its Atmosphere

Samuel H. C. Cabot, Aaron Bello-Arufe, João M. Mendonça +36

We present the discovery of TOI-1518b -- an ultra-hot Jupiter orbiting a bright star . The transiting planet is confirmed using high-resolution optical transmission spect…

astro-ph.EP2021

Asteroseismology of iota Draconis and Discovery of an Additional Long-Period Companion

Michelle L. Hill, Stephen R. Kane, Tiago L. Campante +25

Giant stars as known exoplanet hosts are relatively rare due to the potential challenges in acquiring precision radial velocities and the small predicted transit depths. However, t…

astro-ph.EP2021★ 6 cited

Uncovering the ultimate planet impostor. An eclipsing brown dwarf in a hierarchical triple with two evolved stars

J. Lillo-Box, Á. Ribas, B. Montesinos +14

Exoplanet searches through space-based photometric time series have shown to be very efficient in recent years. However, follow-up efforts on the detected planet candidates have be…

astro-ph.EP2021★ 102 cited

A Preponderance of Perpendicular Planets

Simon H. Albrecht, Marcus L. Marcussen, Joshua N. Winn +2

Observing the Rossiter-McLaughlin effect during a planetary transit allows the determination of the angle between the sky projections of the star's spin axis and the planet's o…

astro-ph.EP2021★ 16 cited

TOI-220 : a warm sub-Neptune discovered by TESS

S. Hoyer, D. Gandolfi, D. J. Armstrong +77

In this paper we report the discovery of TOI-220 , a new sub-Neptune detected by the Transiting Exoplanet Survey Satellite (TESS) and confirmed by radial velocity follow-up obse…

astro-ph.EP2021★ 15 cited

Hot planets around cool stars -- two short-period mini-Neptunes transiting the late K-dwarf TOI-1260

I. Y. Georgieva, C. M. Persson, O. Barragán +56

We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 - a low metallicity K6V…

astro-ph.EP2021★ 392 cited

The TESS Objects of Interest Catalog from the TESS Prime Mission

Natalia M. Guerrero, S. Seager, Chelsea X. Huang +102

We present 2,241 exoplanet candidates identified with data from the Transiting Exoplanet Survey Satellite (TESS) during its two-year prime mission. We list these candidates in the…

astro-ph.EP2021★ 69 cited

A backward-spinning star with two coplanar planets

Maria Hjorth, Simon Albrecht, Teruyuki Hirano +5

It is widely assumed that a star and its protoplanetary disk are initially aligned, with the stellar equator parallel to the disk plane. When observations reveal a misalignment bet…

astro-ph.EP2021★ 90 cited

Masses and compositions of three small planets orbiting the nearby M dwarf L231-32 (TOI-270) and the M dwarf radius valley

Vincent Van Eylen, N. Astudillo-Defru, X. Bonfils +69

We report on precise Doppler measurements of L231-32 (TOI-270), a nearby M dwarf ( pc, M, R), which hosts three transiting p…