Dr. Oscar Barragan Villanueva: Publications

Radial velocity confirmation of K2-100b: a young, highly irradiated, and low-density transiting hot Neptune

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Oxford University Press (OUP) 490:1 (2019) 698-708

Authors:

D Kubyshkina, D Gandolfi, J Livingston, MCV Fridlund, L Fossati, J Korth, H Parviainen, L Malavolta, E Palle, HJ Deeg, G Nowak, VM Rajpaul, N Zicher, G Antoniciello, N Narita, S Albrecht, LR Bedin, J Cabrera, WD Cochran, J de Leon, Ph Eigmueller, A Fukui, N Kusakabe, M Libralato, P Montanes-Rodriguez

Abstract:

© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society We present a detailed analysis of HARPS-N radial velocity observations of K2-100, a young and active star in the Praesepe cluster, which hosts a transiting planet with a period of 1.7 d. We model the activity-induced radial velocity variations of the host star with a multidimensional Gaussian Process framework and detect a planetary signal of 10.6 ± 3.0 m s−1, which matches the transit ephemeris, and translates to a planet mass of 21.8 ± 6.2 M. We perform a suite of validation tests to confirm that our detected signal is genuine. This is the first mass measurement for a transiting planet in a young open cluster. The relatively low density of the planet, 2.04+−006661 g cm−3, implies that K2-100b retains a significant volatile envelope. We estimate that the planet is losing its atmosphere at a rate of 1011–1012 g s−1 due to the high level of radiation it receives from its host star.

Greening of the brown-dwarf desert

Astronomy & Astrophysics EDP Sciences 628 (2019) a64

Authors:

Carina M Persson, Szilárd Csizmadia, Alexander J Mustill, Malcolm Fridlund, Artie P Hatzes, Grzegorz Nowak, Iskra Georgieva, Davide Gandolfi, Melvyn B Davies, John H Livingston, Enric Palle, Pilar Montañes Rodríguez, Michael Endl, Teruyuki Hirano, Jorge Prieto-Arranz, Judith Korth, Sascha Grziwa, Massimiliano Esposito, Simon Albrecht, Marshall C Johnson, Oscar Barragán, Hannu Parviainen, Vincent Van Eylen, Roi Alonso Sobrino, Paul G Beck, Juan Cabrera, Ilaria Carleo, William D Cochran, Fei Dai, Hans J Deeg, Jerome P de Leon, Philipp Eigmüller, Anders Erikson, Akai Fukui, Lucía González-Cuesta, Eike W Guenther, Diego Hidalgo, Maria Hjorth, Petr Kabath, Emil Knudstrup, Nobuhiko Kusakabe, Kristine WF Lam, Mikkel N Lund, Rafael Luque, Savita Mathur, Felipe Murgas, Norio Narita, David Nespral, Prajwal Niraula, AO Henrik Olofsson, Martin Pätzold, Heike Rauer, Seth Redfield, Ignasi Ribas, Marek Skarka, Alexis MS Smith, Jan Subjak, Motohide Tamura

The Transiting Multi-planet System HD15337: Two Nearly Equal-mass Planets Straddling the Radius Gap

The Astrophysical Journal Letters American Astronomical Society 876:2 (2019) l24

Authors:

Davide Gandolfi, Luca Fossati, John H Livingston, Keivan G Stassun, Sascha Grziwa, Oscar Barragán, Malcolm Fridlund, Daria Kubyshkina, Carina M Persson, Fei Dai, Kristine WF Lam, Simon Albrecht, Natalie Batalha, Paul G Beck, Anders Bo Justesen, Juan Cabrera, Scott Cartwright, William D Cochran, Szilard Csizmadia, Misty D Davies, Hans J Deeg, Philipp Eigmüller, Michael Endl, Anders Erikson, Massimiliano Esposito, Rafael A García, Robert Goeke, Lucía González-Cuesta, Eike W Guenther, Artie P Hatzes, Diego Hidalgo, Teruyuki Hirano, Maria Hjorth, Petr Kabath, Emil Knudstrup, Judith Korth, Jie Li, Rafael Luque, Savita Mathur, Pilar Montañes Rodríguez, Norio Narita, David Nespral, Prajwal Niraula, Grzegorz Nowak, Enric Palle, Martin Pätzold, Jorge Prieto-Arranz, Heike Rauer, Seth Redfield, Ignasi Ribas, Marek Skarka, Alexis MS Smith, Pamela Rowden, Guillermo Torres, Vincent Van Eylen, Michael L Vezie

K2-290: a warm Jupiter and a mini-Neptune in a triple-star system

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 484:3 (2019) 3522-3536

Authors:

M Hjorth, AB Justesen, T Hirano, S Albrecht, D Gandolfi, F Dai, R Alonso, O Barragán, M Esposito, M Kuzuhara, KWF Lam, JH Livingston, P Montanes-Rodriguez, N Narita, G Nowak, J Prieto-Arranz, S Redfield, F Rodler, V Van Eylen, JN Winn, G Antoniciello, J Cabrera, WD Cochran, Sz Csizmadia, J de Leon, H Deeg, Ph Eigmüller, M Endl, A Erikson, M Fridlund, S Grziwa, E Guenther, AP Hatzes, P Heeren, D Hidalgo, J Korth, R Luque, D Nespral, E Palle, M Pätzold, CM Persson, H Rauer, AMS Smith, T Trifonov

K2-264: a transiting multiplanet system in the Praesepe open cluster

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 484:1 (2019) 8-18

Authors:

John H Livingston, Fei Dai, Teruyuki Hirano, Davide Gandolfi, Alessandro A Trani, Grzegorz Nowak, William D Cochran, Michael Endl, Simon Albrecht, Oscar Barragan, Juan Cabrera, Szilard Csizmadia, Jerome P de Leon, Hans Deeg, Philipp Eigmüller, Anders Erikson, Malcolm Fridlund, Akihiko Fukui, Sascha Grziwa, Eike W Guenther, Artie P Hatzes, Judith Korth, Masayuki Kuzuhara, Pilar Montañes, Norio Narita, David Nespral, Enric Palle, Martin Pätzold, Carina M Persson, Jorge Prieto-Arranz, Heike Rauer, Motohide Tamura, Vincent Van Eylen, Joshua N Winn

51��