Dr. Oscar Barragan Villanueva: Publications

The Multiplanet System TOI-421: A Warm Neptune and a Super Puffy Mini-Neptune Transiting a G9 V Star in a Visual Binary* * Based on observations made with ESO Telescopes at the La Silla Observatory under programs ID 1102.C-0923, 0103.C-0874, 0103.C-0759, 0103.C-0442, and 60.A-970. Based on observations obtained with the Nordic Optical Telescope (NOT), operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos (ORM) of the Instituto de Astrofísica de Canarias (IAC). This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. This work makes use of observations from the LCOGT network.

The Astronomical Journal American Astronomical Society 160:3 (2020) 114

Authors:

Ilaria Carleo, Davide Gandolfi, Oscar Barragán, John H Livingston, Carina M Persson, Kristine WF Lam, Aline Vidotto, Michael B Lund, Carolina Villarreal D’Angelo, Karen A Collins, Luca Fossati, Andrew W Howard, Daria Kubyshkina, Rafael Brahm, Antonija Oklopčić, Paul Mollière, Seth Redfield, Luisa Maria Serrano, Fei Dai, Malcolm Fridlund, Francesco Borsa, Judith Korth, Massimiliano Esposito, Matías R Díaz, Louise Dyregaard Nielsen, Coel Hellier, Savita Mathur, Hans J Deeg, Artie P Hatzes, Serena Benatti, Florian Rodler, Javier Alarcon, Lorenzo Spina, Ângela RG Santos, Iskra Georgieva, Rafael A García, Lucía González-Cuesta, George R Ricker, Roland Vanderspek, David W Latham, Sara Seager, Joshua N Winn, Jon M Jenkins, Simon Albrecht, Natalie M Batalha, Corey Beard, Patricia T Boyd, François Bouchy, Jennifer A Burt, R Paul Butler, Juan Cabrera, Ashley Chontos, David R Ciardi, William D Cochran, Kevin I Collins, Jeffrey D Crane, Ian Crossfield, Szilard Csizmadia, Diana Dragomir, Courtney Dressing, Philipp Eigmüller, Michael Endl, Anders Erikson, Nestor Espinoza, Michael Fausnaugh, Fabo Feng, Erin Flowers, Benjamin Fulton, Erica J Gonzales, Nolan Grieves, Sascha Grziwa, Eike W Guenther, Natalia M Guerrero, Thomas Henning, Diego Hidalgo, Teruyuki Hirano, Maria Hjorth, Daniel Huber, Howard Isaacson, Matias Jones, Andrés Jordán, Petr Kabáth, Stephen R Kane, Emil Knudstrup, Jack Lubin, Rafael Luque, Ismael Mireles, Norio Narita, David Nespral, Prajwal Niraula, Grzegorz Nowak, Enric Palle, Martin Pätzold, Erik A Petigura, Jorge Prieto-Arranz, Heike Rauer, Paul Robertson, Mark E Rose, Arpita Roy, Paula Sarkis, Joshua E Schlieder, Damien Ségransan, Stephen Shectman, Marek Skarka, Alexis MS Smith, Jeffrey C Smith, Keivan Stassun, Johanna Teske, Joseph D Twicken, Vincent Van Eylen, Sharon Wang, Lauren M Weiss, Aurélien Wyttenbach

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Three planets transiting the evolved star EPIC 249893012: a hot 8.8-M⊕ super-Earth and two warm 14.7 and 10.2-M⊕ sub-Neptunes★★★

Astronomy & Astrophysics EDP Sciences 636 (2020) a89

Authors:

D Hidalgo, E Pallé, R Alonso, D Gandolfi, M Fridlund, G Nowak, R Luque, T Hirano, AB Justesen, WD Cochran, O Barragán, L Spina, F Rodler, S Albrecht, D Anderson, P Amado, E Bryant, JA Caballero, J Cabrera, Sz Csizmadia, F Dai, J De Leon, HJ Deeg, Ph Eigmuller, M Endl, A Erikson, M Esposito, P Figueira, I Georgieva, S Grziwa, E Guenther, AP Hatzes, M Hjorth, HJ Hoeijmakers, P Kabath, J Korth, M Kuzuhara, M Lafarga, M Lampon, IC Leão, J Livingston, S Mathur, P Montañes-Rodriguez, JC Morales, F Murgas, E Nagel, N Narita, LD Nielsen, M Patzold, CM Persson, J Prieto-Arranz, A Quirrenbach, H Rauer, S Redfield, A Reiners, I Ribas, AMS Smith, J Šubjak, V Van Eylen, PA Wilson

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It Takes Two Planets in Resonance to Tango around K2-146

The Astronomical Journal American Astronomical Society 159:3 (2020) 120

Authors:

Kristine WF Lam, Judith Korth, Kento Masuda, Szilárd Csizmadia, Philipp Eigmüller, Gumundur Kári Stefánsson, Michael Endl, Simon Albrecht, Paul Robertson, Rafael Luque, John H Livingston, Teruyuki Hirano, Roi Alonso Sobrino, Oscar Barragán, Juan Cabrera, Ilaria Carleo, Alexander Chaushev, William D Cochran, Fei Dai, Jerome de Leon, Hans J Deeg, Anders Erikson, Massimiliano Esposito, Malcolm Fridlund, Akihiko Fukui, Davide Gandolfi, Iskra Georgieva, Lucá Gonzalez Cuesta, Sascha Grziwa, Eike W Guenther, Artie P Hatzes, Diego Hidalgo, Maria Hjorth, Petr Kabath, Emil Knudstrup, Mikkel N Lund, Suvrath Mahadevan, Savita Mathur, Pilar Montañes Rodríguez, Felipe Murgas, Norio Narita, David Nespral, Prajwal Niraula, Enric Palle, Martin Pätzold, Carina M Persson, Jorge Prieto-Arranz, Heike Rauer, Seth Redfield, Ignasi Ribas, Marek Skarka, Alexis MS Smith, Jan Subjak, Vincent Van Eylen

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A ghost in the toast: TESS background light produces a false “transit” across τ Ceti

Research Notes of the AAS American Astronomical Society 3:10 (2019) 145

Authors:

Nora Eisner, Benjamin Pope, Suzanne Aigrain, Oscar Barragan Villanueva, Timothy R White, Chelsea X Huang, Chris Lintott, Andrey Volkov

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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.

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Dr. Oscar Barragan Villanueva

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Pyaneti

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Three planets transiting the evolved star EPIC 249893012: a hot 8.8-M⊕ super-Earth and two warm 14.7 and 10.2-M⊕ sub-Neptunes★★★

Authors:

It Takes Two Planets in Resonance to Tango around K2-146

Authors:

A ghost in the toast: TESS background light produces a false “transit” across τ Ceti

Authors:

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

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Abstract:

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Dr. Oscar Barragan Villanueva

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Pyaneti

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Three planets transiting the evolved star EPIC 249893012: a hot 8.8-M⊕ super-Earth and two warm 14.7 and 10.2-M⊕ sub-Neptunes★★★

Authors:

It Takes Two Planets in Resonance to Tango around K2-146

Authors:

A ghost in the toast: TESS background light produces a false “transit” across τ Ceti

Authors:

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

Authors:

Abstract: