Dr. Oscar Barragan Villanueva: Publications

The young HD 73583 (TOI-560) planetary system: two 10-M-circle plus mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf

Monthly Notices of the Royal Astronomical Society Oxford University Press 514:2 (2022) 1606-1627

Authors:

O Barragan, Dj Armstrong, D Gandolfi, I Carleo, Aa Vidotto, C Villarreal D'Angelo, A Oklopcic, H Isaacson, D Oddo, K Collins, M Fridlund, Sg Sousa, Cm Persson, C Hellier, S Howell, A Howard, S Redfield, N Eisner, Iy Georgieva, D Dragomir, D Bayliss, Ld Nielsen, B Klein, S Aigrain, M Zhang, J Teske, Jd Twicken, J Jenkins, M Esposito, V Van Eylen, F Rodler, V Adibekyan, J Alarcon, Dr Anderson, JM Akana Murphy, D Barrado, Scc Barros, B Benneke, F Bouchy, Em Bryant, Rp Butler, J Burt, J Cabrera, S Casewell, P Chaturvedi, R Cloutier, Wd Cochran, J Crane, I Crossfield, N Crouzet

Abstract:

We present the discovery and characterization of two transiting planets observed by TESS in the light curves of the young and bright (V = 9.67) star HD73583 (TOI-560). We perform an intensive spectroscopic and photometric space-and ground-based follow-up in order to confirm and characterize the system. We found that HD73583 is a young (∼500 Myr) active star with a rotational period of 12.08 ± 0.11 d, and a mass and radius of 0.73 ± 0.02 M and 0.65 ± 0.02 R, respectively. HD 73583 b (Pb = 6.3980420-0.0000062+ 0.0000067 d) has a mass and radius of 10.2-3.1+ 3.4 M and 2.79 ± 0.10 R, respectively, which gives a density of 2.58-0.81+ 0.95 g, cm-3. HD 73583 c (Pc = 18.87974-0.00074+ 0.00086 d) has a mass and radius of 9.7-1.7+ 1.8 M and 2.39-0.09+ 0.10 R, respectively, which translates to a density of 3.88-0.80+ 0.91g, cm-3. Both planets are consistent with worlds made of a solid core surrounded by a volatile envelope. Because of their youth and host star brightness, they both are excellent candidates to perform transmission spectroscopy studies. We expect ongoing atmospheric mass-loss for both planets caused by stellar irradiation. We estimate that the detection of evaporating signatures on H and He would be challenging, but doable with present and future instruments.

One year of AU Mic with HARPS: I-measuring the masses of the two transiting planets

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2022)

Authors:

Norbert Zicher, Oscar Barragan, Baptiste Klein, Suzanne Aigrain, James E Owen, Davide Gandolfi, Anne-Marie Lagrange, Luisa Maria Serrano, Laurel Kaye, Louise Dyregaard Nielsen, Vinesh Maguire Rajpaul, Antoine Grandjean, Elisa Goffo, Belinda Nicholson

Escaping Helium from TOI 560.01, a Young Mini-Neptune

The Astronomical Journal American Astronomical Society 163:2 (2022) 67

Authors:

Michael Zhang, Heather A Knutson, Lile Wang, Fei Dai, Oscar Barragán

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

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 510:4 (2022) 5035-5049

Authors:

AMS Smith, SN Breton, Sz Csizmadia, F Dai, D Gandolfi, RA García, AW Howard, H Isaacson, J Korth, KWF Lam, S Mathur, G Nowak, F Pérez Hernández, CM Persson, SH Albrecht, O Barragán, J Cabrera, WD Cochran, HJ Deeg, M Fridlund, IY Georgieva, E Goffo, EW Guenther, AP Hatzes, P Kabath, JH Livingston, R Luque, E Palle, S Redfield, F Rodler, LM Serrano, V Van Eylen

A New Third Planet and the Dynamical Architecture of the HD33142 HD 33142 Planetary System

ASTRONOMICAL JOURNAL 164:4 (2022) ARTN 156

Authors:

Trifon Trifonov, Anna Wollbold, Martin Kuerster, Jan Eberhardt, Stephan Stock, Thomas Henning, Sabine Reffert, R Paul Butler, Steven S Vogt, Ansgar Reiners, Man Hoi Lee, Bertram Bitsch, Mathias Zechmeister, Florian Rodler, Volker Perdelwitz, Lev Tal-Or, Jan Rybizki, Paul Heeren, Davide Gandolfi, Oscar Barragan, Olga Zakhozhay, Paula Sarkis, Marcelo Tala Pinto, Diana Kossakowski, Vera Wolthoff, Stefan S Brems, Vera Maria Passegger

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