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

doi:10.3847/1538-3881/ac8154

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 GillArjun 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

Astrophysical Sciences

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18 Scopus citations

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.

Original language	English (US)
Article number	115
Journal	Astronomical Journal
Volume	164
Issue number	3
DOIs	https://doi.org/10.3847/1538-3881/ac8154
State	Published - Sep 1 2022

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.3847/1538-3881/ac8154

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Newton, E. R., Rampalli, R., Kraus, A. L., Mann, A. W., Curtis, J. L., Vanderburg, A., Krolikowski, D. M., Huber, D., Petter, G. C., Bieryla, A., Tofflemire, B. M., Thao, P. C., Wood, M. L., Kerr, R., Safanov, B. S., Strakhov, I. A., Ciardi, D. R., Giacalone, S., Dressing, C. D., ... Latham, D. W. (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. Astronomical Journal, 164(3), Article 115. https://doi.org/10.3847/1538-3881/ac8154

@article{4090c68eb5ef40498a10aba7e264b00d,

title = "TESS Hunt for Young and Maturing Exoplanets (THYME). VII. Membership, Rotation, and Lithium in the Young Cluster Group-X and a New Young Exoplanet",

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 F{\"u}rnkranz 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.",

author = "Newton, {Elisabeth R.} and Rayna Rampalli and Kraus, {Adam L.} and Mann, {Andrew W.} and Curtis, {Jason L.} and Andrew Vanderburg and Krolikowski, {Daniel M.} and Daniel Huber and Petter, {Grayson C.} and Allyson Bieryla and Tofflemire, {Benjamin M.} and Thao, {Pa Chia} and Wood, {Mackenna L.} and Ronan Kerr and Safanov, {Boris S.} and Strakhov, {Ivan A.} and Ciardi, {David R.} and Steven Giacalone and Dressing, {Courtney D.} and Holden Gill and Savel, {Arjun B.} and Collins, {Karen A.} and Peyton Brown and Felipe Murgas and Keisuke Isogai and Norio Narita and Enric Palle and Quinn, {Samuel N.} and Eastman, {Jason D.} and G{\'a}bor F{\H u}r{\'e}sz and Bernie Shiao and Tansu Daylan and Caldwell, {Douglas A.} and Ricker, {George R.} and Roland Vanderspek and Sara Seager and Winn, {Joshua N.} and Jenkins, {Jon M.} and Latham, {David W.}",

note = "Publisher Copyright: {\textcopyright} 2022. The Author(s). Published by the American Astronomical Society.",

year = "2022",

month = sep,

day = "1",

doi = "10.3847/1538-3881/ac8154",

language = "English (US)",

volume = "164",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

number = "3",

}

Newton, ER, Rampalli, R, Kraus, AL, Mann, AW, Curtis, JL, Vanderburg, A, Krolikowski, DM, Huber, D, Petter, GC, Bieryla, A, Tofflemire, BM, Thao, PC, Wood, ML, Kerr, R, Safanov, BS, Strakhov, IA, Ciardi, DR, Giacalone, S, Dressing, CD, Gill, H, Savel, AB, Collins, KA, Brown, P, Murgas, F, Isogai, K, Narita, N, Palle, E, Quinn, SN, Eastman, JD, Fűrész, G, Shiao, B, Daylan, T, Caldwell, DA, Ricker, GR, Vanderspek, R, Seager, S, Winn, JN, Jenkins, JM & Latham, DW 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', Astronomical Journal, vol. 164, no. 3, 115. https://doi.org/10.3847/1538-3881/ac8154

TY - JOUR

T1 - TESS Hunt for Young and Maturing Exoplanets (THYME). VII. Membership, Rotation, and Lithium in the Young Cluster Group-X and a New Young Exoplanet

AU - Newton, Elisabeth R.

AU - Rampalli, Rayna

AU - Kraus, Adam L.

AU - Mann, Andrew W.

AU - Curtis, Jason L.

AU - Vanderburg, Andrew

AU - Krolikowski, Daniel M.

AU - Huber, Daniel

AU - Petter, Grayson C.

AU - Bieryla, Allyson

AU - Tofflemire, Benjamin M.

AU - Thao, Pa Chia

AU - Wood, Mackenna L.

AU - Kerr, Ronan

AU - Safanov, Boris S.

AU - Strakhov, Ivan A.

AU - Ciardi, David R.

AU - Giacalone, Steven

AU - Dressing, Courtney D.

AU - Gill, Holden

AU - Savel, Arjun B.

AU - Collins, Karen A.

AU - Brown, Peyton

AU - Murgas, Felipe

AU - Isogai, Keisuke

AU - Narita, Norio

AU - Palle, Enric

AU - Quinn, Samuel N.

AU - Eastman, Jason D.

AU - Fűrész, Gábor

AU - Shiao, Bernie

AU - Daylan, Tansu

AU - Caldwell, Douglas A.

AU - Ricker, George R.

AU - Vanderspek, Roland

AU - Seager, Sara

AU - Winn, Joshua N.

AU - Jenkins, Jon M.

AU - Latham, David W.

PY - 2022/9/1

Y1 - 2022/9/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85137413687&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85137413687&partnerID=8YFLogxK

U2 - 10.3847/1538-3881/ac8154

DO - 10.3847/1538-3881/ac8154

M3 - Article

AN - SCOPUS:85137413687

SN - 0004-6256

VL - 164

JO - Astronomical Journal

JF - Astronomical Journal

IS - 3

M1 - 115

ER -

TESS Hunt for Young and Maturing Exoplanets (THYME). VII. Membership, Rotation, and Lithium in the Young Cluster Group-X and a New Young Exoplanet

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