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The TESS-Keck Survey II: An Ultra-Short Period Rocky Planet and its Siblings Transiting the Galactic Thick-Disk Star TOI-561 by Weiss, Lauren M.; Dai, Fei; Huber, Daniel; Brewer, John M.; Collins, Karen A.; Ciardi, David R.; Matthews, Elisabeth C.; Ziegler, Carl; Howell, Steve B.; Batalha, Natalie M.; Crossfield, Ian J. M>; Dressing, Courtney; Fulton, Benjamin; Howard, Andrew W.; Isaacson, Howard; Kane, Stephen R.; Petigura, Erik A.; Robertson, Paul; Roy, Arpita; Rubenzahl, Ryan A.; Twicken, Joseph D.; Claytor, Zachary R.; Stassun, Keivan G.; MacDougall, Mason G.; Chontos, Ashley; Giacalone, Steven; Dalba, Paul A.; Mocnik, Teo; Hill, Michelle L.; Beard, Corey; Murphy, Joseph M. Akana; Rosenthal, Lee J.; Behmard, Aida; van Zandt, Judan; Lubin, Jack; Kosiarek, Molly R.; Lund, Michael B.; Christiansen, Jessie L.; Matson, Rachel A.; Beichman, Charles A.; Schlieder, Joshua E.; Gonzales, Erica J.; Briceño, César; Law, Nicholas; Mann, Andrew W.; Collins, Kevin I.; Evans, Phil; Fukui, Akihiko; Jensen, Eric L. N.; Murgas, Felipe; Narita, Norio; Palle, Eric; Parviainen, Hannu; Schwarz, Richard P.; Tan, Thiam-Guan; Acton, Jack S.; Bryant, Edwarf M.; Chaushev, Alexander; Eigmüller, Philipp; Gill, Sam; Jenkins, Jon; Ricker, George; Seager, Sara; Winn, Joshua N. is a scholarly article available to read on EtoBox.

What is The TESS-Keck Survey II: An Ultra-Short Period Rocky Planet and its Siblings Transiting the Galactic Thick-Disk Star TOI-561 about?

We report the discovery of TOI-561, a multi-planet system in the galactic thick disk that contains a rocky, ultra-short period planet (USP). This bright ($V=10.2$) star hosts three small transiting planets identified in photometry from the NASA TESS mission: TOI-561 b (TOI-561.02, P=0.44 days, $R_b = 1.45\pm0.11\,R_\oplus$), c (TOI-561.01, P=10.8 days, $R_c=2.90\pm0.13\,R_\oplus$), and d (TOI-561.03, P=16.3 days, $R_d=2.32\pm0.16\,R_\oplus$). The star is chemically ([Fe/H]$=-0.41\pm0.05$, [$\alpha$/H]$=+0.23\pm0.05$) and kinematically consistent with the galactic thick disk population, making TOI-561 one of the oldest ($10\pm3\,$Gyr) and most metal-poor planetary systems discovered yet. We dynamically confirm planets b and c with radial velocities from the W. M. Keck Observatory High Resolution Echelle Spectrometer. Planet b has a mass and density of $3.2\pm0.8\,M_\oplus$ and $5.5^{+2.0}_{-1.6}\,$g$\,$cm$^{-3}$, consistent with a rocky composition. Its lower-than-average density is consistent with an iron-poor composition, although an Earth-like iron-to-silicates ratio is not ruled out. Planet c is $7.0\pm2.3\,M_\oplus$ and $1.6\pm0.6\,$g$\,$cm$^{-3}$, consistent with an interior r

Author

Weiss, Lauren M.; Dai, Fei; Huber, Daniel; Brewer, John M.; Collins, Karen A.; Ciardi, David R.; Matthews, Elisabeth C.; Ziegler, Carl; Howell, Steve B.; Batalha, Natalie M.; Crossfield, Ian J. M>; Dressing, Courtney; Fulton, Benjamin; Howard, Andrew W.; Isaacson, Howard; Kane, Stephen R.; Petigura, Erik A.; Robertson, Paul; Roy, Arpita; Rubenzahl, Ryan A.; Twicken, Joseph D.; Claytor, Zachary R.; Stassun, Keivan G.; MacDougall, Mason G.; Chontos, Ashley; Giacalone, Steven; Dalba, Paul A.; Mocnik, Teo; Hill, Michelle L.; Beard, Corey; Murphy, Joseph M. Akana; Rosenthal, Lee J.; Behmard, Aida; van Zandt, Judan; Lubin, Jack; Kosiarek, Molly R.; Lund, Michael B.; Christiansen, Jessie L.; Matson, Rachel A.; Beichman, Charles A.; Schlieder, Joshua E.; Gonzales, Erica J.; Briceño, César; Law, Nicholas; Mann, Andrew W.; Collins, Kevin I.; Evans, Phil; Fukui, Akihiko; Jensen, Eric L. N.; Murgas, Felipe; Narita, Norio; Palle, Eric; Parviainen, Hannu; Schwarz, Richard P.; Tan, Thiam-Guan; Acton, Jack S.; Bryant, Edwarf M.; Chaushev, Alexander; Eigmüller, Philipp; Gill, Sam; Jenkins, Jon; Ricker, George; Seager, Sara; Winn, Joshua N.

Published

2020

Language

EN