An ultra-short-period transiting super-Earth orbiting the M3 dwarf TOI-1685

DOI: 
10.1051/0004-6361/202140688
Publication date: 
24/06/2021
Main author: 
Bluhm, P.
IAA authors: 
Amado, P. J.
Authors: 
Bluhm, P.;Pallé, E.;Molaverdikhani, K.;Kemmer, J.;Hatzes, A. P.;Kossakowski, D.;Stock, S.;Caballero, J. A.;Lillo-Box, J.;Béjar, V. J. S.;Soto, M. G.;Amado, P. J.;Brown, P.;Cadieux, C.;Cloutier, R.;Collins, K. A.;Collins, K. I.;Cortés-Contreras, M.;Doyon, R.;Dreizler, S.;Espinoza, N.;Fukui, A.;González-Álvarez, E.;Henning, Th.;Horne, K.;Jeffers, S. V.;Jenkins, J. M.;Jensen, E. L. N.;Kaminski, A.;Kielkopf, J. F.;Kusakabe, N.;Kürster, M.;Lafrenière, D.;Luque, R.;Murgas, F.;Montes, D.;Morales, J. C.;Narita, N.;Passegger, V. M.;Quirrenbach, A.;Schöfer, P.;Reffert, S.;Reiners, A.;Ribas, I.;Ricker, G. R.;Seager, S.;Schweitzer, A.;Schwarz, R. P.;Tamura, M.;Trifonov, T.;Vanderspek, R.;Winn, J.;Zechmeister, M.;Zapatero Osorio, M. R.
Journal: 
Astronomy and Astrophysics
Publication type: 
Article
Volume: 
650
Pages: 
A78
Abstract: 
Dynamical histories of planetary systems, as well as the atmospheric evolution of highly irradiated planets, can be studied by characterizing the ultra-short-period planet population, which the TESS mission is particularly well suited to discover. Here, we report on the follow-up of a transit signal detected in the TESS sector 19 photometric time series of the M3.0 V star TOI-1685 (2MASS J04342248+4302148). We confirm the planetary nature of the transit signal, which has a period of P<SUB>b</SUB> = 0.6691403<SUB>−0.0000021</SUB><SUP>+0.0000023</SUP> d, using precise radial velocity measurements taken with the CARMENES spectrograph. From the joint photometry and radial velocity analysis, we estimate the following parameters for TOI-1685 b: a mass of M<SUB>b</SUB> = 3.78<SUB>−0.63</SUB><SUP>+0.63</SUP> M<SUB>⊕</SUB>, a radius of R<SUB>b</SUB> = 1.70<SUB>−0.07</SUB><SUP>+0.07</SUP> R<SUB>⊕</SUB>, which together result in a bulk density of ρ<SUB>b</SUB> = 4.21<SUB>−0.82</SUB><SUP>+0.95</SUP> g cm<SUP>−3</SUP>, and an equilibrium temperature of T<SUB>eq</SUB> = 1069<SUB>−16</SUB><SUP>+16</SUP> K. TOI-1685 b is the least dense ultra-short-period planet around an M dwarf known to date. TOI-1685 b is also one of the hottest transiting super-Earth planets with accurate dynamical mass measurements, which makes it a particularly attractive target for thermal emission spectroscopy. Additionally, we report with moderate evidence an additional non-transiting planet candidate in the system, TOI-1685 [c], which has an orbital period of P<SUB>c</SUB> = 9.02<SUB>−0.12</SUB><SUP>+0.10</SUP> d.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2021A&A...650A..78B/abstract
ADS Bibcode: 
2021A&A...650A..78B
Keywords: 
techniques: photometric;techniques: radial velocities;stars: individual: TOI-1685;stars: late-type;Astrophysics - Earth and Planetary Astrophysics