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19932026
Showing 2021 · astro-ph.EPShow all

117 papers · 2 filters

astro-ph.EP2021★ 35 cited

Silicon in the dayside atmospheres of two ultra-hot Jupiters

D. Cont, F. Yan, A. Reiners +22

Atmospheres of highly irradiated gas giant planets host a large variety of atomic and ionic species. Here we observe the thermal emission spectra of the two ultra-hot Jupiters WASP…

astro-ph.EP2021★ 73 cited

p-winds: an open-source Python code to model planetary outflows and upper atmospheres

Leonardo A. Dos Santos, Aline A. Vidotto, Shreyas Vissapragada +6

Atmospheric escape is considered to be one of the main channels for evolution in sub-Jovian planets, particularly in their early lives. While there are several hypotheses proposed…

astro-ph.EP2021★ 27 cited

Early planet formation in embedded protostellar disks: Setting the stage for the first generation of planetesimals

A. J. Cridland, G. P. Rosotti, B. Tabone +3

(Abridged) Recent surveys of young star formation regions have shown that the average Class II object does not have enough dust mass to make the cores of giant planets. Younger Cla…

astro-ph.EP2021★ 52 cited

A wide-orbit giant planet in the high-mass b Centauri binary system

Markus Janson, Raffaele Gratton, Laetitia Rodet +24

Planet formation occurs around a wide range of stellar masses and stellar system architectures. An improved understanding of the formation process can be achieved by studying it ac…

astro-ph.EP2021

Atmospheric mass loss and stellar wind effects in young and old systems II: Is TOI-942 the past of TOI-421 system?

Daria Kubyshkina, Aline A. Vidotto, Carolina Villarreal D'Angelo +3

The two planetary systems TOI-942 and TOI-421 share many similar characteristics, apart from their ages (50~Myr and 9~Gyr). Each of the stars hosts two sub-Neptune-like planets at…

astro-ph.EP2021

Atmospheric mass loss and stellar wind effects in young and old systems I: comparative 3D study of TOI-942 and TOI-421 systems

Daria Kubyshkina, Aline A. Vidotto, Carolina Villarreal D'Angelo +3

At young ages, when radiation from the host star is high, and the planet is hot and inflated after formation, planetary atmospheric mass loss can be extremely strong compared to ol…

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★ 47 cited

The mass and size of Herbig disks as seen by ALMA

L. Stapper, M. R. Hogerheijde, E. F. van Dishoeck +1

Many population studies have been performed with the Atacama Large Millimeter/submillimeter Array (ALMA) to understand the bulk properties of protoplanetary disks around young star…

astro-ph.EP2021★ 28 cited

Effect of MHD wind-driven disk evolution on the observed sizes of protoplanetary disks

Leon Trapman, Benoit Tabone, Giovanni Rosotti +1

It is still unclear whether the evolution of protoplanetary disks, a key ingredient in the theory of planet formation, is driven by viscous turbulence or magnetic disk winds. As vi…

astro-ph.EP2021★ 1 cited

Probing inner and outer disk misalignments in transition disks

A. J. Bohn, M. Benisty, K. Perraut +16

For several transition disks (TDs), dark regions interpreted as shadows have been observed in scattered light imaging and are hypothesized to originate from misalignments between d…

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

MHD disc winds can reproduce fast disc dispersal and the correlation between accretion rate and disc mass in Lupus

Benoît Tabone, Giovanni P. Rosotti, Giuseppe Lodato +3

The final architecture of planetary systems depends on the extraction of angular momentum and mass-loss processes of the discs in which they form. Theoretical studies proposed that…

astro-ph.EP2021★ 51 cited

High-resolution transmission spectroscopy study of ultra-hot Jupiters HAT-P-57b, KELT-17b, KELT-21b, KELT-7b, MASCARA-1b, and WASP-189b

M. Stangret, N. Casasayas-Barris, E. Pallé +5

Ultra-hot jupiters (UHJs) are giant planets on short orbital periods with high equilibrium temperature (T_eq) values. Their hot, extended atmospheres are perfect laboratories for t…

astro-ph.EP2021★ 9 cited

An extended scattered light disk around AT Pyx -- Possible planet formation in a cometary globule

C. Ginski, R. Gratton, A. Bohn +35

To understand how the multitude of planetary systems that have been discovered come to be, we need to study systems at different evolutionary stages, with different central stars b…

astro-ph.EP2021★ 10 cited

Moderately misaligned orbit of the warm sub-Saturn HD 332231 b

Elyar Sedaghati, Alejando Sánchez-López, Stefan Czesla +9

Measurements of exoplanetary orbital obliquity angles for different classes of planets are an essential tool in testing various planet formation theories. Measurements for those tr…

astro-ph.EP2021★ 57 cited

The impact of coronal mass ejections and flares on the atmosphere of the hot Jupiter HD189733b

Gopal Hazra, Aline A. Vidotto, Stephen Carolan +2

High-energy stellar irradiation can photoevaporate planetary atmospheres, which can be observed in spectroscopic transits of hydrogen lines. For the exoplanet HD189733b, multiple o…

astro-ph.EP2021★ 97 cited

An Atomic Spectral Survey of WASP-76b: Resolving Chemical Gradients and Asymmetries

Aurora Y. Kesseli, I. A. G. Snellen, N. Casasayas-Barris +2

Ultra-hot Jupiters are gas giants that orbit so close to their host star that they are tidally locked, causing a permanent hot dayside and a cooler nightside. Signatures of their n…

astro-ph.EP2021★ 78 cited

Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops

P. F. L. Maxted, D. Ehrenreich, T. G. Wilson +77

CHEOPS(CHaracterising ExOPlanet Satellite) is an ESA S-class mission that observes bright stars at high cadence from low-Earth orbit. The main aim of the mission is to characterize…

astro-ph.EP2021★ 20 cited

Self-consistent modelling of the dust component in protoplanetary and circumplanetary disks: the case of PDS 70

B. Portilla-Revelo, I. Kamp, Ch. Rab +4

Direct observations of young stellar objects are important to test established theories of planet formation. PDS 70 is one of the few cases where robust evidence favours the presen…

astro-ph.EP2021★ 74 cited

A new planet candidate detected in a dust gap of the disc around HD 163296 through localised kinematic signatures. An observational validation of the Discminer

Andres F. Izquierdo, Stefano Facchini, Giovanni P. Rosotti +2

We report the robust detection of coherent, localised deviations from Keplerian rotation possibly associated with the presence of two giant planets embedded in the disc around HD 1…

astro-ph.EP2021★ 11 cited

Turbulent Disk Viscosity and the Bifurcation of Planet Formation Histories

Jessica Speedie, Ralph E. Pudritz, Alex J. Cridland +2

ALMA observations of dust ring/gap structures in a minority but growing sample of protoplanetary disks can be explained by the presence of planets at large disk radii - yet the ori…

astro-ph.EP2021★ 3 cited

K2 Discovery of a Circumsecondary Disk Transiting EPIC 220208795

L. van der Kamp, D. M. van Dam, M. A. Kenworthy +2

Observations of the star EPIC 220208795 (2MASS J01105556+0018507) reveal a single, deep and asymmetric eclipse, which we hypothesize is due to an eclipsing companion surrounded by…

astro-ph.EP2021★ 7 cited

The strange case of Na I in the atmosphere of HD209458 b: Reconciling low- and high-resolution spectroscopic observations G

Giuseppe Morello, Núria Casasayas-Barris, Jaume Orell-Miquel +3

Aims. We aim to investigate the origin of the discrepant results reported in the literature about the presence of Na I in the atmosphere of HD209458 b, based on low- and high-resol…

astro-ph.EP2021★ 56 cited

Detection of OH in the ultra-hot Jupiter WASP-76b

Rico Landman, Alejandro Sànchez-López, Paul Mollière +3

Ultra-hot Jupiters have dayside temperatures at which most molecules are expected to thermally dissociate. The dissociation of water vapour results in the production of the hydroxy…