Language selection

Government of Canada / Gouvernement du Canada

Search

SCExAO/CHARIS direct imaging discovery of a 20 au separation, low-mass ratio brown dwarf companion to an accelerating sun-like star*

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.3847/2041-8213/abc631
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0002-7405-3119; Search for: ORCID identifier: https://orcid.org/0000-0003-2630-8073; Search for: ORCID identifier: https://orcid.org/0000-0002-4677-9182; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-1097-9908; Search for: 1ORCID identifier: https://orcid.org/0000-0002-4164-4182; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0002-3047-1845; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0003-2806-1254; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0001-5213-6207; Search for: ORCID identifier: https://orcid.org/0000-0003-1180-4138; Search for: ORCID identifier: https://orcid.org/0000-0002-4309-6343; Search for: ORCID identifier: https://orcid.org/0000-0001-9823-1445; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0003-0168-3010; Search for: ORCID identifier: https://orcid.org/0000-0002-7618-6556; Search for: ; Search for: ORCID identifier: https://orcid.org/0000-0001-8345-593X; Search for: ORCID identifier: https://orcid.org/0000-0002-9259-1164; Search for: ORCID identifier: https://orcid.org/0000-0003-2815-7774; Search for: ORCID identifier: https://orcid.org/0000-0002-6964-8732; Search for: ORCID identifier: https://orcid.org/0000-0003-0241-8956; Search for: ORCID identifier: https://orcid.org/0000-0002-6879-3030; Search for: ORCID identifier: https://orcid.org/0000-0001-9209-1808; Search for: ORCID identifier: https://orcid.org/0000-0002-6510-0681
Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FunderSearch for: NASA-Keck/JPL; Search for: USRA/NASA Sr. Postdoctoral Fellowship Program; Search for: MEXT ∣ Japan Society for the Promotion of Science
FormatText, Article
Physical description8 p.
Subjectexoplanets (498); brown dwarfs (185); astronomical instrumentation (799); astronomical optics (88); direct imaging (387); coronagraphic imaging (313); exoplanet detection methods (489); astronomical techniques (1684)
Abstract
We present the direct imaging discovery of a substellar companion to the nearby Sun-like star, HD 33632 Aa, at a projected separation of ∼20 au, obtained with SCExAO/CHARIS integral field spectroscopy complemented by Keck/NIRC2 thermal infrared imaging. The companion, HD 33632 Ab, induces a 10.5σ astrometric acceleration on the star as detected with the Gaia and Hipparcos satellites. SCExAO/CHARIS JHK (1.1–2.4 μm) spectra and Keck/NIRC2 Lₚ (3.78 μm) photometry are best matched by a field L/T transition object: an older, higher-gravity, and less dusty counterpart to HR 8799 cde. Combining our astrometry with Gaia/Hipparcos data and archival Lick Observatory radial velocities, we measure a dynamical mass of 46.4 ± 8 MJ and an eccentricity of e < 0.46 at 95% confidence. HD 33632 Ab's mass and mass ratio (4.0% ± 0.7%) are comparable to the low-mass brown dwarf GJ 758 B and intermediate between the more massive brown dwarf HD 19467 B and the (near-)planet-mass companions to HR 2562 and GJ 504. Using Gaia to select for direct imaging observations with the newest extreme adaptive optics systems can reveal substellar or even planet-mass companions on solar system–like scales at an increased frequency compared to blind surveys.
Publication date
PublisherIOP
In
  • The Astrophysical Journal Letters 904, no. 2, L25 (1 December 2020).
LanguageEnglish
Peer reviewedYes
Export citationExport as RIS
Report a correctionReport a correction (opens in a new tab)
Record identifiere58565bf-3eaa-4ac5-ad97-22e2d522148e
Record created2022-06-27
Record modified2022-06-27
Date modified: