Details

Autor(en) / Beteiligte

• Cloutier, Ryan
• Rodriguez, Joseph E.
• Irwin, Jonathan
• Charbonneau, David
• Stassun, Keivan G.
• Mortier, Annelies
• Latham, David W.
• Isaacson, Howard
• Howard, Andrew W.
• Udry, Stéphane
• Wilson, Thomas G.
• Watson, Christopher A.
• Pinamonti, Matteo
• Lienhard, Florian
• Giacobbe, Paolo
• Guerra, Pere
• Collins, Karen A.
• Beiryla, Allyson
• Esquerdo, Gilbert A.
• Matthews, Elisabeth
• Matson, Rachel A.
• Howell, Steve B.
• Furlan, Elise
• Crossfield, Ian J. M.
• Winters, Jennifer G.
• Nava, Chantanelle
• Ment, Kristo
• Lopez, Eric D.
• Ricker, George
• Vanderspek, Roland
• Seager, Sara
• Jenkins, Jon M.
• Ting, Eric B.
• Tenenbaum, Peter
• Sozzetti, Alessandro
• Sha, Lizhou
• Ségransan, Damien
• Schlieder, Joshua E.
• Sasselov, Dimitar
• Roy, Arpita
• Robertson, Paul
• Rice, Ken
• Poretti, Ennio
• Piotto, Giampaolo
• Phillips, David
• Pepper, Joshua
• Pepe, Francesco
• Molinari, Emilio
• Mocnik, Teo
• Micela, Giuseppina
• Mayor, Michel
• Martinez Fiorenzano, Aldo F.
• Mallia, Franco
• Lubin, Jack
• Lovis, Christophe
• López-Morales, Mercedes
• Kosiarek, Molly R.
• Kielkopf, John F.
• Kane, Stephen R.
• Jensen, Eric L. N.
• Isopi, Giovanni
• Huber, Daniel
• Hill, Michelle L.
• Harutyunyan, Avet
• Gonzales, Erica
• Giacalone, Steven
• Ghedina, Adriano
• Ercolino, Andrea
• Dumusque, Xavier
• Dressing, Courtney D.
• Damasso, Mario
• Dalba, Paul A.
• Cosentino, Rosario
• Conti, Dennis M.
• Colón, Knicole D.
• Collins, Kevin I.
• Cameron, Andrew Collier
• Ciardi, David
• Christiansen, Jessie
• Chontos, Ashley
• Cecconi, Massimo
• Caldwell, Douglas A.
• Burke, Christopher
• Buchhave, Lars
• Beichman, Charles
• Behmard, Aida
• Beard, Corey
• Akana Murphy, Joseph M.

Titel

TOI-1235 b: A Keystone Super-Earth for Testing Radius Valley Emergence Models around Early M Dwarfs

Ist Teil von

• The Astronomical journal, 2020-07, Vol.160 (1), p.22

Ort / Verlag

Goddard Space Flight Center: The American Astronomical Society

Erscheinungsjahr

2020

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Small planets on close-in orbits tend to exhibit envelope mass fractions of either effectively zero or up to a few percent depending on their size and orbital period. Models of thermally driven atmospheric mass loss and of terrestrial planet formation in a gas-poor environment make distinct predictions regarding the location of this rocky/nonrocky transition in period-radius space. Here we present the confirmation of TOI-1235 b (P = 3.44 days, ), a planet whose size and period are intermediate between the competing model predictions, thus making the system an important test case for emergence models of the rocky/nonrocky transition around early M dwarfs (Rs = 0.630 0.015 , Ms = 0.640 0.016 ). We confirm the TESS planet discovery using reconnaissance spectroscopy, ground-based photometry, high-resolution imaging, and a set of 38 precise radial velocities (RVs) from HARPS-N and HIRES. We measure a planet mass of , which implies an iron core mass fraction of % in the absence of a gaseous envelope. The bulk composition of TOI-1235 b is therefore consistent with being Earth-like, and we constrain an H/He envelope mass fraction to be <0.5% at 90% confidence. Our results are consistent with model predictions from thermally driven atmospheric mass loss but not with gas-poor formation, suggesting that the former class of processes remains efficient at sculpting close-in planets around early M dwarfs. Our RV analysis also reveals a strong periodicity close to the first harmonic of the photometrically determined stellar rotation period that we treat as stellar activity, despite other lines of evidence favoring a planetary origin ( days, ) that cannot be firmly ruled out by our data.