New spectro-photometric characterization of the substellar object HR 2562 B using SPHERE^★

¹ INAF-Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, Padova 35122, Italy
e-mail: dino.mesa@oapd.inaf.it
² INCT, Universidad De Atacama, calle Copayapu 485, Copiapó, Atacama, Chile
³ Department of Physics, University of Oxford, Oxford, UK
⁴ LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 Place Jules Janssen, 92195 Meudon, France
⁵ Virtual Planetary Laboratory, University of Washington, Seattle, WA 98125, USA
⁶ Univ. Grenoble Alpes, IPAG; CNRS, IPAG, 38000 Grenoble, France
⁷ Univ. Lyon, Univ. Lyon 1, ENS de Lyon, CNRS, CRAL UMR 5574, 69230 Saint-Genis-Laval, France
⁸ Aix-Marseille Université, CNRS, LAM “Laboratoire d’Astrophysique de Marseille”, UMR 7326, 13388 Marseille, France
⁹ Nucleo de Astronomía, Facultad de Ingeniería, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile
¹⁰ Universidad de Chile, Camino el Observatorio, 1515 Santiago, Chile
¹¹ Max-Planck-Institut für Astronomie, Känigstuhl 17, 69117 Heidelberg, Germany
¹² Department of Astronomy, Stockholm University, 10691 Stockholm, Sweden
¹³ INAF Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
¹⁴ INAF Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123 Catania, Italy
¹⁵ INAF Osservatorio Astronomico di Capodimonte, Via Moiariello 16, 80131 Napoli, Italy
¹⁶ Unidad Mixta Internacional Franco-Chilena de Astronomía, CNRS/INSU UMI 3386 and Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
¹⁷ INAF Osservatorio Astronomico di Brera, via Emilio Bianchi 46, 23807 Merate (LC), Italy
¹⁸ INAF Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano, Via E. Bassini 15, 20133 Milano, Italy
¹⁹ Université Côte d’Azur, OCA, CNRS, Lagrange, France

Received: 26 July 2017
Accepted: 14 December 2017

Abstract

Aims. HR 2562 is an F5V star located at ~33 pc from the Sun hosting a substellar companion that was discovered using the Gemini planet imager (GPI) instrument. The main objective of the present paper is to provide an extensive characterization of the substellar companion, by deriving its fundamental properties.

Methods. We observed HR 2562 with the near-infrared branch composed by the integral field spectrograph (IFS) and the infrared dual band spectrograph (IRDIS) of the spectro-polarimetric high-contrast exoplanet research (SPHERE) instrument at the very large telescope (VLT). During our observations IFS was operating in the Y J band, while IRDIS was observing with the H broadband filter. The data were reduced with the dedicated SPHERE GTO pipeline, which is custom designed for this instrument. On the reduced images, we then applied the post-processing procedures that are specifically prepared to subtract the speckle noise.

Results. The companion is clearly detected in both IRDIS and IFS datasets. We obtained photometry in three different spectral bands. The comparison with template spectra allowed us to derive a spectral type of T2–T3 for the companion. Using both evolutionary and atmospheric models we inferred the main physical parameters of the companion obtaining a mass of 32 ± 14 M_Jup, T_eff = 1100 ± 200 K, and log g = 4.75 ± 0.41.