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TESS Hunt for Young and Maturing Exoplanets (THYME). V. A Sub-Neptune Transiting a Young Star in a Newly Discovered 250 Myr Association

Tofflemire, Benjamin M. ; Rizzuto, Aaron C. ; Newton, Elisabeth R. ; Kraus, Adam L. ; Mann, Andrew W. ; Vanderburg, Andrew ; Nelson, Tyler ; Hawkins, Keith ; Wood, Mackenna L. ; Zhou, George ; Quinn, Samuel N. ; Howell, Steve B. ; Collins, Karen A. ; Schwarz, Richard P. ; Stassun, Keivan G. ; Bouma, Luke G. ; Essack, Zahra ; Osborn, Hugh ; Boyd, Patricia T. ; Fűrész, Gábor ; Glidden, Ana ; Twicken, Joseph D. ; Wohler, Bill ; McLean, Brian ; Ricker, George R. ; Vanderspek, Roland ; Latham, David W. ; Seager, S. ; Winn, Joshua N. ; Jenkins, Jon M.

The Astronomical journal, 2021-04, Vol.161 (4), p.171 [Periódico revisado por pares]

Ames Research Center: IOP Publishing / American Astronomical Society

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Título:
TESS Hunt for Young and Maturing Exoplanets (THYME). V. A Sub-Neptune Transiting a Young Star in a Newly Discovered 250 Myr Association
Autor: Tofflemire, Benjamin M. ; Rizzuto, Aaron C. ; Newton, Elisabeth R. ; Kraus, Adam L. ; Mann, Andrew W. ; Vanderburg, Andrew ; Nelson, Tyler ; Hawkins, Keith ; Wood, Mackenna L. ; Zhou, George ; Quinn, Samuel N. ; Howell, Steve B. ; Collins, Karen A. ; Schwarz, Richard P. ; Stassun, Keivan G. ; Bouma, Luke G. ; Essack, Zahra ; Osborn, Hugh ; Boyd, Patricia T. ; Fűrész, Gábor ; Glidden, Ana ; Twicken, Joseph D. ; Wohler, Bill ; McLean, Brian ; Ricker, George R. ; Vanderspek, Roland ; Latham, David W. ; Seager, S. ; Winn, Joshua N. ; Jenkins, Jon M.
Assuntos: ABSORPTION ; Age ; AGE ESTIMATION ; Astronomy ; Astrophysics ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; Binary stars ; Companion stars ; COMPUTERIZED SIMULATION ; Dating techniques ; DETECTION ; Extrasolar planets ; Image resolution ; Light curve ; LITHIUM ; NEPTUNE PLANET ; Orbits ; OTHER INSTRUMENTATION ; PHASE SPACE ; PHOTOMETRY ; Planetary evolution ; Planetary systems ; RESOLUTION ; ROTATION ; Sequences ; SPECTRA ; STARS ; Stellar age
É parte de: The Astronomical journal, 2021-04, Vol.161 (4), p.171
Notas: ARC
Ames Research Center
Descrição: The detection and characterization of young planetary systems offer a direct path to study the processes that shape planet evolution. We report on the discovery of a sub-Neptune-sized planet orbiting the young star HD 110082 (TOI-1098). Transit events we initially detected during TESS Cycle 1 are validated with time-series photometry from Spitzer. High-contrast imaging and high-resolution, optical spectra are also obtained to characterize the stellar host and confirm the planetary nature of the transits. The host star is a late-F dwarf (M⁎ = 1.2Mꙩ) with a low-mass, M dwarf binary companion (M⁎ = 0.26Mꙩ) separated by nearly one arcminute (∼6200 au). Based on its rapid rotation and Lithium absorption, HD 110082 is young, but is not a member of any known group of young stars (despite proximity to the Octans association). To measure the age of the system, we search for coeval, phase-space neighbors and compile a sample of candidate siblings to compare with the empirical sequences of young clusters and to apply quantitative age-dating techniques. In doing so, we find that HD 110082 resides in a new young stellar association we designate MELANGE-1, with an age of 250(+50, -70) Myr. Jointly modeling the TESS and Spitzer light curves, we measure a planetary orbital period of 10.1827 days and radius of R(p) = 3.2 ± 0.1Rꚛ. HD 110082 b’s radius falls in the largest 12% of field-age systems with similar host-star mass and orbital period. This finding supports previous studies indicating that young planets have larger radii than their field-age counterparts.
Editor: Ames Research Center: IOP Publishing / American Astronomical Society
Idioma: Inglês

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TESS Hunt for Young and Maturing Exoplanets (THYME). V. A Sub-Neptune Transiting a Young Star in a Newly Discovered 250 Myr Association

Ames Research Center: IOP Publishing / American Astronomical Society

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