The Astronomical Journal (Jan 2023)
HIP 33609 b: An Eccentric Brown Dwarf Transiting a V = 7.3 Rapidly Rotating B Star
- Noah Vowell,
- Joseph E. Rodriguez,
- Samuel N. Quinn,
- George Zhou,
- Andrew Vanderburg,
- Andrew W. Mann,
- Matthew J. Hooton,
- Keivan G. Stassun,
- Saburo Howard,
- Allyson Bieryla,
- David W. Latham,
- Steve B. Howell,
- Tristan Guillot,
- Carl Ziegler,
- Karen A. Collins,
- Theron W. Carmichael,
- Jon M. Jenkins,
- Avi Shporer,
- Lyu ABE,
- Philippe Bendjoya,
- Jonathan L. Bush,
- Marco Buttu,
- Kevin I. Collins,
- Jason D. Eastman,
- Matthew J. Fields,
- Thomas Gasparetto,
- Maximilian N. Günther,
- Veselin B. Kostov,
- Adam L. Kraus,
- Kathryn V. Lester,
- Alan M. Levine,
- Colin Littlefield,
- Wenceslas Marie-Sainte,
- Djamel Mékarnia,
- Hugh P. Osborn,
- David Rapetti,
- George R. Ricker,
- S. Seager,
- Ramotholo Sefako,
- Gregor Srdoc,
- Olga Suarez,
- Guillermo Torres,
- Amaury H. M. J. Triaud,
- R. Vanderspek,
- Joshua N. Winn
Affiliations
- Noah Vowell
- ORCiD
- Center for Data Intensive and Time Domain Astronomy, Department of Physics and Astronomy, Michigan State University , East Lansing, MI 48824, USA ; [email protected]
- Joseph E. Rodriguez
- ORCiD
- Center for Data Intensive and Time Domain Astronomy, Department of Physics and Astronomy, Michigan State University , East Lansing, MI 48824, USA ; [email protected]
- Samuel N. Quinn
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- George Zhou
- ORCiD
- University of Southern Queensland , West Street, Darling Heights QLD 4350, Australia
- Andrew Vanderburg
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Andrew W. Mann
- ORCiD
- Department of Physics and Astronomy, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, USA
- Matthew J. Hooton
- ORCiD
- Cavendish Laboratory , JJ Thomson Avenue, Cambridge, CB3 0HE, UK
- Keivan G. Stassun
- ORCiD
- Department of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235, USA; Department of Physics, Fisk University , 1000 17th Avenue North, Nashville, TN 37208, USA
- Saburo Howard
- ORCiD
- Université Côte d’Azur , Observatoire de la Côte d’Azur, CNRS, Lagrange Laboratory, Nice, France
- Allyson Bieryla
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- David W. Latham
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Steve B. Howell
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA
- Tristan Guillot
- ORCiD
- Université Côte d’Azur , Observatoire de la Côte d’Azur, CNRS, Lagrange Laboratory, Nice, France
- Carl Ziegler
- Department of Physics, Engineering and Astronomy, Stephen F. Austin State University , 1936 North Street, Nacogdoches, TX 75962, USA
- Karen A. Collins
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Theron W. Carmichael
- ORCiD
- Institute for Astronomy, University of Edinburgh , Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK
- Jon M. Jenkins
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA
- Avi Shporer
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Lyu ABE
- ORCiD
- Université Côte d’Azur , Observatoire de la Côte d’Azur, CNRS, Lagrange Laboratory, Nice, France
- Philippe Bendjoya
- ORCiD
- Université Côte d’Azur , Observatoire de la Côte d’Azur, CNRS, Lagrange Laboratory, Nice, France
- Jonathan L. Bush
- ORCiD
- Department of Physics and Astronomy, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, USA
- Marco Buttu
- ORCiD
- INAF—Osservatorio Astronomico di Cagliari , Cagliari, Italy
- Kevin I. Collins
- ORCiD
- George Mason University , 4400 University Drive, Fairfax, VA 22030 USA
- Jason D. Eastman
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Matthew J. Fields
- ORCiD
- Department of Physics and Astronomy, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, USA
- Thomas Gasparetto
- ORCiD
- Institute of Polar Sciences—CNR , via Torino, 155 I-30172 Venice-Mestre, Italy
- Maximilian N. Günther
- ORCiD
- European Space Agency (ESA) , European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
- Veselin B. Kostov
- ORCiD
- NASA Goddard Space Flight Center , 8800 Greenbelt Road, Greenbelt, MD 20771, USA; SETI Institute , 189 Bernardo Ave, Suite 200, Mountain View, CA 94043, USA
- Adam L. Kraus
- ORCiD
- Department of Astronomy, The University of Texas at Austin , Austin, TX 78712, USA
- Kathryn V. Lester
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA
- Alan M. Levine
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Colin Littlefield
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA; Bay Area Environmental Research Institute , Moffett Field, CA 94035, USA
- Wenceslas Marie-Sainte
- Institut Paul Emile Victor , Concordia Station, Antarctica
- Djamel Mékarnia
- ORCiD
- Université Côte d’Azur , Observatoire de la Côte d’Azur, CNRS, Lagrange Laboratory, Nice, France
- Hugh P. Osborn
- Department of Physics and Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Physikalisches Institut, University of Bern , Gesellsschaftstrasse 6, 3012 Bern, Switzerland
- David Rapetti
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA; Research Institute for Advanced Computer Science, Universities Space Research Association , Washington, DC 20024, USA
- George R. Ricker
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- S. Seager
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USA; Department of Earth, Atmospheric, and Planetary Sciences, Ma ssachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Ramotholo Sefako
- ORCiD
- South African Astronomical Observatory , P.O. Box 9, Observatory 7935, Cape Town, South Africa
- Gregor Srdoc
- Kotizarovci Observatory , Sarsoni 90, 51216 Viskovo, Croatia
- Olga Suarez
- ORCiD
- Université Côte d’Azur , Observatoire de la Côte d’Azur, CNRS, Lagrange Laboratory, Nice, France
- Guillermo Torres
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Amaury H. M. J. Triaud
- ORCiD
- School of Physics & Astronomy, University of Birmingham , Edgbaston, Birmingham B15 2TT, UK
- R. Vanderspek
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research , Massachusetts Institute of Technology, Cambridge, MA 02139, USA
- Joshua N. Winn
- ORCiD
- Department of Astrophysical Sciences, Princeton University , Princeton, NJ 08544, USA
- DOI
- https://doi.org/10.3847/1538-3881/acd197
- Journal volume & issue
-
Vol. 165,
no. 6
p. 268
Abstract
We present the discovery and characterization of HIP 33609 b, a transiting warm brown dwarf orbiting a late B star, discovered by NASA's Transiting Exoplanet Survey Satellite as TOI-588 b. HIP 33609 b is a large ( R _b = ${1.580}_{-0.070}^{+0.074}$ R _J ) brown dwarf on a highly eccentric ( e = ${0.560}_{-0.031}^{+0.029}$ ) orbit with a 39 days period. The host star is a bright ( V = 7.3 mag), T _eff = 10,400 ${}_{-660}^{+800}$ K star with a mass of M _* = ${2.383}_{-0.095}^{+0.10}$ M _⊙ and radius of R _* = ${1.863}_{-0.082}^{+0.087}$ R _⊙ , making it the hottest transiting brown dwarf host star discovered to date. We obtained radial velocity measurements from the CHIRON spectrograph confirming the companion's mass of M _b = ${68.0}_{-7.1}^{+7.4}$ M _J as well as the host star's rotation rate ( $v\sin {i}_{* }=55.6\pm 1.8$ km s ^−1 ). We also present the discovery of a new comoving group of stars, designated as MELANGE-6, and determine that HIP 33609 is a member. We use a combination of rotation periods and isochrone models fit to the cluster members to estimate an age of 150 ± 25 Myr. With a measured mass, radius, and age, HIP 33609 b becomes a benchmark for substellar evolutionary models.
Keywords
- Exoplanets
- Brown dwarfs
- Young star clusters
- Direct imaging
- CCD photometry
- High resolution spectroscopy
