The Astronomical Journal (Jan 2022)
TESS Hunt for Young and Maturing Exoplanets (THYME). VII. Membership, Rotation, and Lithium in the Young Cluster Group-X and a New Young Exoplanet
- Elisabeth R. Newton,
- Rayna Rampalli,
- Adam L. Kraus,
- Andrew W. Mann,
- Jason L. Curtis,
- Andrew Vanderburg,
- Daniel M. Krolikowski,
- Daniel Huber,
- Grayson C. Petter,
- Allyson Bieryla,
- Benjamin M. Tofflemire,
- Pa Chia Thao,
- Mackenna L. Wood,
- Ronan Kerr,
- Boris S. Safanov,
- Ivan A. Strakhov,
- David R. Ciardi,
- Steven Giacalone,
- Courtney D. Dressing,
- Holden Gill,
- Arjun B. Savel,
- Karen A. Collins,
- Peyton Brown,
- Felipe Murgas,
- Keisuke Isogai,
- Norio Narita,
- Enric Palle,
- Samuel N. Quinn,
- Jason D. Eastman,
- Gábor Fűrész,
- Bernie Shiao,
- Tansu Daylan,
- Douglas A. Caldwell,
- George R. Ricker,
- Roland Vanderspek,
- Sara Seager,
- Joshua N. Winn,
- Jon M. Jenkins,
- David W. Latham
Affiliations
- Elisabeth R. Newton
- ORCiD
- Department of Physics and Astronomy, Dartmouth College , Hanover, NH 03755, USA ; [email protected]
- Rayna Rampalli
- ORCiD
- Department of Physics and Astronomy, Dartmouth College , Hanover, NH 03755, USA ; [email protected]
- Adam L. Kraus
- ORCiD
- Department of Astronomy, The University of Texas at Austin , Austin, TX 78712, USA
- Andrew W. Mann
- ORCiD
- Department of Physics and Astronomy, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, USA
- Jason L. Curtis
- ORCiD
- Department of Astronomy, Columbia University , 550 West 120th Street, New York, NY 10027, USA
- Andrew Vanderburg
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Daniel M. Krolikowski
- ORCiD
- Department of Astronomy, The University of Texas at Austin , Austin, TX 78712, USA
- Daniel Huber
- ORCiD
- Institute for Astronomy, University of Hawaiì , 2680 Woodlawn Drive, Honolulu, HI 96822, USA
- Grayson C. Petter
- ORCiD
- Department of Physics and Astronomy, Dartmouth College , Hanover, NH 03755, USA ; [email protected]
- Allyson Bieryla
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Benjamin M. Tofflemire
- ORCiD
- Department of Astronomy, The University of Texas at Austin , Austin, TX 78712, USA
- Pa Chia Thao
- ORCiD
- Department of Physics and Astronomy, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, USA
- Mackenna L. Wood
- ORCiD
- Department of Physics and Astronomy, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, USA
- Ronan Kerr
- ORCiD
- Department of Astronomy, The University of Texas at Austin , Austin, TX 78712, USA
- Boris S. Safanov
- ORCiD
- Sternberg Astronomical Institute Lomonosov Moscow State University , 13 Universitetskij pr., 119234, Moscow, Russia
- Ivan A. Strakhov
- ORCiD
- Sternberg Astronomical Institute Lomonosov Moscow State University , 13 Universitetskij pr., 119234, Moscow, Russia
- David R. Ciardi
- ORCiD
- Caltech/IPAC-NASA Exoplanet Science Institute , 770 S. Wilson Avenue, Pasadena, CA 91106, USA
- Steven Giacalone
- ORCiD
- Department of Astronomy, The University of California , Berkeley, CA 94720, USA
- Courtney D. Dressing
- ORCiD
- Department of Astronomy, The University of California , Berkeley, CA 94720, USA
- Holden Gill
- ORCiD
- Department of Astronomy, The University of California , Berkeley, CA 94720, USA
- Arjun B. Savel
- ORCiD
- Department of Astronomy, The University of Maryland , College Park, MD 20782, USA
- Karen A. Collins
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Peyton Brown
- ORCiD
- Department of Physics and Astronomy, Vanderbilt University , 6301 Stevenson Center Lane, Nashville, TN 37235, USA
- Felipe Murgas
- ORCiD
- Instituto de Astrofísica de Canarias (IAC), E-38200 La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL) , E-38206, La Laguna, Tenerife, Spain
- Keisuke Isogai
- Okayama Observatory, Kyoto University , 3037-5 Honjo, Kamogatacho, Asakuchi, Okayama 719-0232, Japan; Department of Multi-Disciplinary Sciences, Graduate School of Arts and Sciences, The University of Tokyo , 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan
- Norio Narita
- ORCiD
- Instituto de Astrofísica de Canarias (IAC), E-38200 La Laguna, Tenerife, Spain; Komaba Institute for Science, The University of Tokyo , 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan; Astrobiology Center , 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
- Enric Palle
- ORCiD
- Departamento de Astrofísica, Universidad de La Laguna (ULL) , E-38206, La Laguna, Tenerife, Spain; Instituto de Astrofísica de Canarias (IAC) , E-38205 La Laguna, Tenerife, Spain
- Samuel N. Quinn
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Jason D. Eastman
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- Gábor Fűrész
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Bernie Shiao
- Space Telescope Science Institute , 3700 San Martin Drive, Baltimore, MD, 21218, USA
- Tansu Daylan
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08544, USA
- Douglas A. Caldwell
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA; SETI Institute , Mountain View, CA 94043, USA
- George R. Ricker
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Roland Vanderspek
- ORCiD
- Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
- Sara 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, Massachusetts Institute of Technology , Cambridge, MA 02139, USA; Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
- Joshua N. Winn
- ORCiD
- Department of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08544, USA
- Jon M. Jenkins
- ORCiD
- NASA Ames Research Center , Moffett Field, CA 94035, USA
- David W. Latham
- ORCiD
- Center for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
- DOI
- https://doi.org/10.3847/1538-3881/ac8154
- Journal volume & issue
-
Vol. 164,
no. 3
p. 115
Abstract
The public, all-sky surveys Gaia and TESS provide the ability to identify new young associations and determine their ages. These associations enable study of planetary evolution by providing new opportunities to discover young exoplanets. A young association was recently identified by Tang et al. and Fürnkranz et al. using astrometry from Gaia (called “Group-X” by the former). In this work, we investigate the age and membership of this association, and we validate the exoplanet TOI 2048 b, which was identified to transit a young, late G dwarf in Group-X using photometry from TESS. We first identified new candidate members of Group-X using Gaia EDR3 data. To infer the age of the association, we measured rotation periods for candidate members using TESS data. The clear color–period sequence indicates that the association is the same age as the 300 ± 50 Myr old NGC 3532. We obtained optical spectra for candidate members that show lithium absorption consistent with this young age. Further, we serendipitously identify a new, small association nearby Group-X, which we call MELANGE-2. Lastly, we statistically validate TOI 2048 b, which is a 2.1 ± 0.2 R _⊕ radius planet on a 13.8-day orbit around its 300 Myr old host star.
Keywords
