TESS-Keck Survey. V. Twin Sub-Neptunes Transiting the Nearby G Star HD 63935
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TESS-Keck Survey. V. Twin Sub-Neptunes Transiting the Nearby G Star HD 63935. / Scarsdale, Nicholas; Murphy, Joseph M. Akana; Batalha, Natalie M.; Crossfield, Ian J. M.; Dressing, Courtney D.; Fulton, Benjamin; Howard, Andrew W.; Huber, Daniel; Isaacson, Howard; Kane, Stephen R.; Petigura, Erik A.; Robertson, Paul; Roy, Arpita; Weiss, Lauren M.; Beard, Corey; Behmard, Aida; Chontos, Ashley; Christiansen, Jessie L.; Ciardi, David R.; Claytor, Zachary R.; Collins, Karen A.; Collins, Kevin; Dai, Fei; Dalba, Paul A.; Dragomir, Diana; Fetherolf, Tara; Fukui, Akihiko; Giacalone, Steven; Gonzales, Erica J.; Hill, Michelle L.; Hirsch, Lea A.; Jensen, Eric L. N.; Kosiarek, Molly R.; de Leon, Jerome P.; Lubin, Jack; Lund, Michael B.; Luque, Rafael; Mayo, Andrew W.; Mocnik, Teo; Mori, Mayuko; Narita, Norio; Nowak, Grzegorz; Palle, Enric; Rabus, Markus; Rosenthal, Lee J.; Rubenzahl, Ryan A.; Schlieder, Joshua E.; Shporer, Avi; Stassun, Keivan G.; Twicken, Joe; Wang, Gavin; Yahalomi, Daniel A.; Jenkins, Jon; Latham, David W.; Ricker, George R.; Seager, S.; Vanderspek, Roland; Winn, Joshua N.
I: Astronomical Journal, Bind 162, Nr. 5, 215, 26.10.2021.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - TESS-Keck Survey. V. Twin Sub-Neptunes Transiting the Nearby G Star HD 63935
AU - Scarsdale, Nicholas
AU - Murphy, Joseph M. Akana
AU - Batalha, Natalie M.
AU - Crossfield, Ian J. M.
AU - Dressing, Courtney D.
AU - Fulton, Benjamin
AU - Howard, Andrew W.
AU - Huber, Daniel
AU - Isaacson, Howard
AU - Kane, Stephen R.
AU - Petigura, Erik A.
AU - Robertson, Paul
AU - Roy, Arpita
AU - Weiss, Lauren M.
AU - Beard, Corey
AU - Behmard, Aida
AU - Chontos, Ashley
AU - Christiansen, Jessie L.
AU - Ciardi, David R.
AU - Claytor, Zachary R.
AU - Collins, Karen A.
AU - Collins, Kevin
AU - Dai, Fei
AU - Dalba, Paul A.
AU - Dragomir, Diana
AU - Fetherolf, Tara
AU - Fukui, Akihiko
AU - Giacalone, Steven
AU - Gonzales, Erica J.
AU - Hill, Michelle L.
AU - Hirsch, Lea A.
AU - Jensen, Eric L. N.
AU - Kosiarek, Molly R.
AU - de Leon, Jerome P.
AU - Lubin, Jack
AU - Lund, Michael B.
AU - Luque, Rafael
AU - Mayo, Andrew W.
AU - Mocnik, Teo
AU - Mori, Mayuko
AU - Narita, Norio
AU - Nowak, Grzegorz
AU - Palle, Enric
AU - Rabus, Markus
AU - Rosenthal, Lee J.
AU - Rubenzahl, Ryan A.
AU - Schlieder, Joshua E.
AU - Shporer, Avi
AU - Stassun, Keivan G.
AU - Twicken, Joe
AU - Wang, Gavin
AU - Yahalomi, Daniel A.
AU - Jenkins, Jon
AU - Latham, David W.
AU - Ricker, George R.
AU - Seager, S.
AU - Vanderspek, Roland
AU - Winn, Joshua N.
PY - 2021/10/26
Y1 - 2021/10/26
N2 - We present the discovery of two nearly identically sized sub-Neptune transiting planets orbiting HD 63935, a bright (V = 8.6 mag), Sun-like (T (eff) = 5560 K) star at 49 pc. TESS identified the first planet, HD 63935 b (TOI-509.01), in Sectors 7 and 34. We identified the second signal (HD 63935 c) in Keck High Resolution Echelle Spectrometer and Lick Automated Planet Finder radial velocity data as part of our follow-up campaign. It was subsequently confirmed with TESS photometry in Sector 34 as TOI-509.02. Our analysis of the photometric and radial velocity data yielded a robust detection of both planets with periods of 9.0600 +/- 0.007 and 21.40 +/- 0.0019 days, radii of 2.99 +/- 0.14 and 2.90 +/- 0.13 R (circle plus), and masses of 10.8 +/- 1.8 and 11.1 +/- 2.4 M (circle plus). We calculated densities for planets b and c consistent with a few percent of the planet mass in hydrogen/helium envelopes. We also describe our survey's efforts to choose the best targets for James Webb Space Telescope atmospheric follow-up. These efforts suggest that HD 63935 b has the most clearly visible atmosphere of its class. It is the best target for transmission spectroscopy (ranked by the transmission spectroscopy metric, a proxy for atmospheric observability) in the so far uncharacterized parameter space comprising sub-Neptune-sized (2.6 R (circle plus) < R (p) < 4 R (circle plus)), moderately irradiated (100 F (circle plus) < F (p) < 1000 F (circle plus)) planets around G stars. Planet c is also a viable target for transmission spectroscopy, and given the indistinguishable masses and radii of the two planets, the system serves as a natural laboratory for examining the processes that shape the evolution of sub-Neptune planets.
AB - We present the discovery of two nearly identically sized sub-Neptune transiting planets orbiting HD 63935, a bright (V = 8.6 mag), Sun-like (T (eff) = 5560 K) star at 49 pc. TESS identified the first planet, HD 63935 b (TOI-509.01), in Sectors 7 and 34. We identified the second signal (HD 63935 c) in Keck High Resolution Echelle Spectrometer and Lick Automated Planet Finder radial velocity data as part of our follow-up campaign. It was subsequently confirmed with TESS photometry in Sector 34 as TOI-509.02. Our analysis of the photometric and radial velocity data yielded a robust detection of both planets with periods of 9.0600 +/- 0.007 and 21.40 +/- 0.0019 days, radii of 2.99 +/- 0.14 and 2.90 +/- 0.13 R (circle plus), and masses of 10.8 +/- 1.8 and 11.1 +/- 2.4 M (circle plus). We calculated densities for planets b and c consistent with a few percent of the planet mass in hydrogen/helium envelopes. We also describe our survey's efforts to choose the best targets for James Webb Space Telescope atmospheric follow-up. These efforts suggest that HD 63935 b has the most clearly visible atmosphere of its class. It is the best target for transmission spectroscopy (ranked by the transmission spectroscopy metric, a proxy for atmospheric observability) in the so far uncharacterized parameter space comprising sub-Neptune-sized (2.6 R (circle plus) < R (p) < 4 R (circle plus)), moderately irradiated (100 F (circle plus) < F (p) < 1000 F (circle plus)) planets around G stars. Planet c is also a viable target for transmission spectroscopy, and given the indistinguishable masses and radii of the two planets, the system serves as a natural laboratory for examining the processes that shape the evolution of sub-Neptune planets.
KW - ERROR-CORRECTION
KW - PLANET
KW - LIGHT
KW - EXOPLANETS
KW - TELESCOPE
KW - DENSITY
KW - II.
KW - I.
U2 - 10.3847/1538-3881/ac18cb
DO - 10.3847/1538-3881/ac18cb
M3 - Journal article
VL - 162
JO - The Astronomical Journal
JF - The Astronomical Journal
SN - 0004-6256
IS - 5
M1 - 215
ER -
ID: 283800681