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ESO 3.6m telescope, Oscar for escale

ESO 3.6m telescope, Oscar for escale.

Credit: Oscar Barragán

Dr. Oscar Barragan Villanueva

Postdoctoral Research Assistant

Research theme

  • Astronomy and astrophysics
  • Exoplanets and planetary physics

Sub department

  • Astrophysics

Research groups

  • Exoplanets and Stellar Physics
oscar.barragan@physics.ox.ac.uk
Personal webpage
Github
Publications
ORCID:0000-0003-0563-0493
  • About
  • Current projects
  • Publications
logo pyaneti
Pyaneti

pyaneti is a code that allows to fit multi-planet signals in RV and photometric data

Check the code here

The young HD 73583 (TOI-560) planetary system: Two 10-M$_\oplus$ mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf

(2021)

Authors:

O Barragán, DJ Armstrong, D Gandolfi, I Carleo, AA Vidotto, C Villarreal D'Angelo, A Oklopčić, 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, P Butler, J Burt, J Cabrera, S Casewell, P Chaturvedi, R Cloutier, WD Cochran, J Crane, I Crossfield, N Crouzet, KI Collins, F Dai, HJ Deeg, A Deline, ODS Demangeon, X Dumusque, P Figueira, E Furlan, C Gnilka, MR Goad, E Goffo, F Gutiérrez-Canales, A Hadjigeorghiou, Z Hartman, AP Hatzes, M Harris, B Henderson, T Hirano, S Hojjatpanah, S Hoyer, P Kabáth, J Korth, J Lillo-Box, R Luque, M Marmier, T Močnik, A Muresan, F Murgas, E Nagel, HLM Osborne, A Osborn, HP Osborn, E Palle, M Raimbault, GR Ricker, RA Rubenzahl, C Stockdale, NC Santos, N Scott, RP Schwarz, S Shectman, M Raimbault, S Seager, D Ségransan, LM Serrano, M Skarka, AMS Smith, J Šubjak, TG Tan, S Udry, C Watson, PJ Wheatley, R West, JN Winn, SX Wang, A Wolfgang, C Ziegler
More details from the publisher
Details from ArXiV

PYANETI II: a multi-dimensional Gaussian process approach to analysing spectroscopic time-series

Monthly Notices of the Royal Astronomical Society Oxford University Press 509:1 (2021) 866-883

Authors:

Oscar Barragan Villanueva, Suzanne Aigrain, Vinesh M Rajpaul, Norbert Zicher

Abstract:

The two most successful methods for exoplanet detection rely on the detection of planetary signals in photometric and radial velocity time-series. This depends on numerical techniques that exploit the synergy between data and theory to estimate planetary, orbital, and/or stellar parameters. In this work we present a new version of the exoplanet modelling code pyaneti. This new release has a special emphasis on the modelling of stellar signals in radial velocity time-series. The code has a built-in multi-dimensional Gaussian process approach to modelling radial velocity and activity indicator time-series with different underlying covariance functions. This new version of the code also allows multi-band and single transit modelling; it runs on Python 3, and features overall improvements in performance. We describe the new implementation and provide tests to validate the new routines that have direct application to exoplanet detection and characterisation. We have made the code public and freely available at https://github.com/oscaribv/pyaneti. We also present the codes citlalicue and citlalatonac that allow one to create synthetic photometric and spectroscopic time-series, respectively, with planetary and stellar-like signals.
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Details from ORA
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Details from ArXiV

Masses and compositions of three small planets orbiting the nearby M dwarf L231-32 (TOI-270) and the M dwarf radius valley

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 507:2 (2021) 2154-2173

Authors:

V Van Eylen, N Astudillo-Defru, X Bonfils, J Livingston, T Hirano, R Luque, KWF Lam, AB Justesen, JN Winn, D Gandolfi, G Nowak, E Palle, S Albrecht, F Dai, B Campos Estrada, JE Owen, D Foreman-Mackey, M Fridlund, J Korth, S Mathur, T Forveille, T Mikal-Evans, HLM Osborne, CSK Ho, JM Almenara, E Artigau, O Barragán, SCC Barros, F Bouchy, J Cabrera, DA Caldwell, D Charbonneau, P Chaturvedi, WD Cochran, S Csizmadia, M Damasso, X Delfosse, JR De Medeiros, RF Díaz, R Doyon, M Esposito, G Fűrész, P Figueira, I Georgieva, E Goffo, S Grziwa, E Guenther, AP Hatzes, JM Jenkins, P Kabath, E Knudstrup, DW Latham, B Lavie, C Lovis, RE Mennickent, SE Mullally, F Murgas, N Narita, FA Pepe, CM Persson, S Redfield, GR Ricker, NC Santos, S Seager, LM Serrano, AMS Smith, A Suárez Mascareño, J Subjak, JD Twicken, S Udry, R Vanderspek, MR Zapatero Osorio
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About the modelling of the SED for the inner boundary of protoplanetary discs at the lower stellar mass regime

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 506:4 (2021) 5361-5372

Authors:

Sebastián Morales-Gutiérrez, Erick Nagel, Oscar Barragan
More details from the publisher

Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 505:4 (2021) 4684-4701

Authors:

IY Georgieva, CM Persson, O Barragán, G Nowak, M Fridlund, D Locci, E Palle, R Luque, I Carleo, D Gandolfi, SR Kane, J Korth, KG Stassun, J Livingston, EC Matthews, KA Collins, SB Howell, LM Serrano, S Albrecht, A Bieryla, CE Brasseur, D Ciardi, WD Cochran, KD Colon, IJM Crossfield, Sz Csizmadia, HJ Deeg, M Esposito, E Furlan, T Gan, E Goffo, E Gonzales, S Grziwa, EW Guenther, P Guerra, T Hirano, JM Jenkins, ELN Jensen, P Kabáth, E Knudstrup, KWF Lam, DW Latham, AM Levine, RA Matson, S McDermott, HLM Osborne, M Paegert, SN Quinn, S Redfield, GR Ricker, JE Schlieder, NJ Scott, S Seager, AMS Smith, P Tenenbaum, JD Twicken, R Vanderspek, V Van Eylen, JN Winn
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