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

TL;DR

This paper presents a detailed spectro-photometric analysis of the substellar companion HR 2562 B using SPHERE, deriving its physical properties and spectral type through advanced observational and data reduction techniques.

Contribution

It provides the first extensive characterization of HR 2562 B, including spectral type, mass, temperature, and gravity, using high-contrast imaging and spectral analysis.

Findings

Spectral type T2-T3 for HR 2562 B.

Mass estimated at 32±14 MJup.

Effective temperature around 1100±200 K.

Abstract

HR2562 is an F5V star located at ~33 pc from the Sun hosting a substellar companion that was discovered using the GPI instrument. The main objective of the present paper is to provide an extensive characterisation of the substellar companion, by deriving its fundamental properties. We observed HR 2562 with the near-infrared branch (IFS and IRDIS) of SPHERE at the VLT. During our observations IFS was operating in the YJ band, while IRDIS was observing with the $H$ broad-band 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. 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$~MJup, T_{eff}=1100+/-200 K and log(g)=4.75+/-0.41.