The Companions to B and A Stars Snapshot (C-BASS) Survey: I. Discovery of a Young Brown Dwarf Companion to HIP 17453

arXiv:2606.30733 · astro-ph.SR, astro-ph.EP · Submitted 2026-06-29 · Read on arXiv

Marah Brinjikji, Adam J. Smith, Jennifer Patience, Eric Nielsen, Austin Ware, Jorge A. Sanchez, Robert J. De Rosa, Jasmine Garani, Emma Softich, Michael C. Liu, Bruce Macintosh, Thomas M. Esposito, Brendan P. Bowler, William M. Best, Sarah Blunt, Trent Dupuy, Justin Hom, Jessica A. Klusmeyer, Franck Marchis, Jayke S. Nguyen, Anne E. Peck, Mark W. Phillips, William Roberson, Jean-Baptiste Ruffio, William Thompson, Zahed Wahhaj, Samuel A. Walker, Jason J. Wang, Patrick A. Young

astro-ph.SR, astro-ph.EP

Submitted: 2026-06-29

Comments: 30 pages, 15 figures, 4 tables, accepted in the Astronomical Journal

License: http://creativecommons.org/licenses/by/4.0/

The gist: We report the detection of a new brown dwarf companion to HIP 17453 A, a chemically peculiar A0V star located at a distance of 81 pc.

Terminology

Core — 9× in this paper · explained in 2 episodes
Benchmark — 6× in this paper · explained in 2 episodes
Metallicity — 6× in this paper · explained in 3 episodes
Abundance — 5× in this paper · explained in 1 episode
Aperture — 4× in this paper · explained in 1 episode
Calibration — 3× in this paper · explained in 7 episodes
Consistency — 3× in this paper · explained in 3 episodes
Trace — 3× in this paper · explained in 2 episodes
Alignment — 2× in this paper · explained in 1 episode
Gemini Near Infra-Red Spectrograph — 2× in this paper
Keck Observatory Archive — 2× in this paper
Society of Photo-Optical Instrumentation Engineers — 2× in this paper
Adam — 1× in this paper · explained in 2 episodes
Aperture Photometry — 1× in this paper · explained in 1 episode
Association of Universities for Research in Astronomy — 1× in this paper
Bayesian Inference — 1× in this paper · explained in 5 episodes
Degeneracy — 1× in this paper · explained in 3 episodes
Gemini Near-Infrared Coronagraphic Imager — 1× in this paper

Abstract

We report the detection of a new brown dwarf companion to HIP 17453 A, a chemically peculiar A0V star located at a distance of 81 pc. HIP 17453 A was observed with high-resolution adaptive optics imaging using the Near-Infrared Camera 2 on the Keck II telescope as part of the Companions to B and A Stars Snapshot (C-BASS) survey over a ten-year baseline, revealing the presence of a companion with proper motion consistent with the primary. We estimate the age of the HIP 17453 system as 280 plus or minus 125 Myr, and with follow-up intermediate resolution (R 1800) spectroscopic observations with the Gemini Near Infra-Red Spectrograph (GNIRS) on the Gemini-North telescope, we found the spectrum of HIP 17453 B to be consistent with a spectral type of L2 plus or minus 1. Through interpolation of Sonora Diamondback evolutionary models, we calculate an effective temperature of 1953+84-78 K and mass of 53+10-8 M Jup for HIP 17453 B, which corresponds to a mass ratio of q = 0.024 plus or minus 0.004 for the HIP 17453 system. With its intermediate mass and young age, HIP 17453 B joins a small set of benchmark brown dwarf companions around early-type stars that are suitable for follow-up atmospheric and evolutionary studies.

The Companions to B and A Stars Snapshot (C-BASS) Survey: I. Discovery of a Young Brown Dwarf Companion to HIP 17453

Terminology

Abstract

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