Independent confirmation of {\beta} Pictoris b imaging with NICI

TL;DR

This study independently confirms the existence of the exoplanet {eta} Pictoris b using NICI images from Gemini South, providing new observational evidence with a different telescope and imaging technique.

Contribution

It presents the first independent confirmation of {eta} Pictoris b with a telescope other than VLT, using high contrast imaging and archival NICI data.

Findings

Detection of {eta} Pictoris b at 404 mas separation in 2010 NICI images.

First observation of the planet with a telescope different from VLT.

Confirmation supports previous planet characterization and system models.

Abstract

Context. {\beta} Pictoris b is one of the most studied objects nowadays since it was identified with VLT/NaCo as a bona-fide exoplanet with a mass of about 9 times that of Jupiter at an orbital separation of 8-9 AU. The link between the planet and the dusty disk is unambiguously attested and this system provides an opportunity to study the disk/planet interactions and to constrain formation and evolutionary models of gas giant planets. Still, {\beta} Pictoris b had never been confirmed with other telescopes so far. Aims. We aimed at an independent confirmation using a different instrument. Methods. We retrieved archive images from Gemini South obtained with the instrument NICI, which is designed for high contrast imaging. The observations combine coronagraphy and angular differential imaging and were obtained at three epochs in Nov. 2008, Dec. 2009 and Dec. 2010. Results. We report the detection with NICI of the planet {\beta} Pictoris b in Dec. 2010 images at a separation of 404 \pm 10 mas and P A = 212.1 \pm 0.7{\deg} . It is the first time this planet is observed with a telescope different than the VLT.