Molly Nies, Ismael Mireles, François Bouchy, Diana Dragomir, Belinda A Nicholson, Nora L Eisner, Sergio G Sousa, Karen A Collins, Steve B Howell, Carl Ziegler, Coel Hellier, Brett Addison, Sarah Ballard, Brendan P Bowler, César Briceño, Catherine A Clark, Dennis M Conti, Xavier Dumusque, Billy Edwards, Crystal L Gnilka, Melissa Hobson, Jonathan Horner, Stephen R Kane, John Kielkopf, Baptiste Lavie, Nicholas Law, Monika Lendl, Colin Littlefield, Huigen Liu, Andrew W Mann, Matthew W Mengel, Dominic Oddo, Jack Okumura, Enric Palle, Peter Plavchan, Angelica Psaridi, Nuno C Santos, Richard P Schwarz, Avi Shporer, Robert A Wittenmyer, Duncan J Wright, Hui Zhang, David Watanabe, Jennifer V Medina, Joel Villaseñor, Eric B Ting, Jessie L Christiansen, Joshua N Winn, Keivan G Stassun, S Seager, David W Latham, George R Ricker
{"title":"HD 21520 b:一颗温暖的亚海王星凌日一颗明亮的G矮星","authors":"Molly Nies, Ismael Mireles, François Bouchy, Diana Dragomir, Belinda A Nicholson, Nora L Eisner, Sergio G Sousa, Karen A Collins, Steve B Howell, Carl Ziegler, Coel Hellier, Brett Addison, Sarah Ballard, Brendan P Bowler, César Briceño, Catherine A Clark, Dennis M Conti, Xavier Dumusque, Billy Edwards, Crystal L Gnilka, Melissa Hobson, Jonathan Horner, Stephen R Kane, John Kielkopf, Baptiste Lavie, Nicholas Law, Monika Lendl, Colin Littlefield, Huigen Liu, Andrew W Mann, Matthew W Mengel, Dominic Oddo, Jack Okumura, Enric Palle, Peter Plavchan, Angelica Psaridi, Nuno C Santos, Richard P Schwarz, Avi Shporer, Robert A Wittenmyer, Duncan J Wright, Hui Zhang, David Watanabe, Jennifer V Medina, Joel Villaseñor, Eric B Ting, Jessie L Christiansen, Joshua N Winn, Keivan G Stassun, S Seager, David W Latham, George R Ricker","doi":"10.1093/mnras/stae2079","DOIUrl":null,"url":null,"abstract":"We report the discovery and validation of HD 21520 b, a transiting planet found with TESS and orbiting a bright G dwarf (V=9.2, Teff = 5871 ± 62 K, R⋆ = 1.04 ± 0.02 R⊙). HD 21520 b was originally alerted as a system (TOI-4320) consisting of two planet candidates with periods of 703.6 and 46.4 days. However, our analysis supports instead a single-planet system with an orbital period of 25.1292 ± 0.0001 days and radius of 2.70 ± 0.09 R⊕. Three full transits in sectors 4, 30 and 31 match this period and have transit depths and durations in agreement with each other, as does a partial transit in sector 3. We also observe transits using CHEOPS and LCOGT. SOAR and Gemini high-resolution imaging do not indicate the presence of any nearby companions, and Minerva-Australis and CORALIE radial velocities rule out an on-target spectroscopic binary. Additionally, we use ESPRESSO radial velocities to obtain a tentative mass measurement of $7.9^{+3.2}_{-3.0}\\, M_{\\hbox{$\\oplus $}}$, with a 3-σ upper limit of 17.7 M⊕. Due to the bright nature of its host and likely significant gas envelope of the planet, HD 21520 b is a promising candidate for further mass measurements and for atmospheric characterization.","PeriodicalId":18930,"journal":{"name":"Monthly Notices of the Royal Astronomical Society","volume":"43 1","pages":""},"PeriodicalIF":4.7000,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"HD 21520 b: a warm sub-Neptune transiting a bright G dwarf\",\"authors\":\"Molly Nies, Ismael Mireles, François Bouchy, Diana Dragomir, Belinda A Nicholson, Nora L Eisner, Sergio G Sousa, Karen A Collins, Steve B Howell, Carl Ziegler, Coel Hellier, Brett Addison, Sarah Ballard, Brendan P Bowler, César Briceño, Catherine A Clark, Dennis M Conti, Xavier Dumusque, Billy Edwards, Crystal L Gnilka, Melissa Hobson, Jonathan Horner, Stephen R Kane, John Kielkopf, Baptiste Lavie, Nicholas Law, Monika Lendl, Colin Littlefield, Huigen Liu, Andrew W Mann, Matthew W Mengel, Dominic Oddo, Jack Okumura, Enric Palle, Peter Plavchan, Angelica Psaridi, Nuno C Santos, Richard P Schwarz, Avi Shporer, Robert A Wittenmyer, Duncan J Wright, Hui Zhang, David Watanabe, Jennifer V Medina, Joel Villaseñor, Eric B Ting, Jessie L Christiansen, Joshua N Winn, Keivan G Stassun, S Seager, David W Latham, George R Ricker\",\"doi\":\"10.1093/mnras/stae2079\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We report the discovery and validation of HD 21520 b, a transiting planet found with TESS and orbiting a bright G dwarf (V=9.2, Teff = 5871 ± 62 K, R⋆ = 1.04 ± 0.02 R⊙). HD 21520 b was originally alerted as a system (TOI-4320) consisting of two planet candidates with periods of 703.6 and 46.4 days. However, our analysis supports instead a single-planet system with an orbital period of 25.1292 ± 0.0001 days and radius of 2.70 ± 0.09 R⊕. Three full transits in sectors 4, 30 and 31 match this period and have transit depths and durations in agreement with each other, as does a partial transit in sector 3. We also observe transits using CHEOPS and LCOGT. SOAR and Gemini high-resolution imaging do not indicate the presence of any nearby companions, and Minerva-Australis and CORALIE radial velocities rule out an on-target spectroscopic binary. Additionally, we use ESPRESSO radial velocities to obtain a tentative mass measurement of $7.9^{+3.2}_{-3.0}\\\\, M_{\\\\hbox{$\\\\oplus $}}$, with a 3-σ upper limit of 17.7 M⊕. Due to the bright nature of its host and likely significant gas envelope of the planet, HD 21520 b is a promising candidate for further mass measurements and for atmospheric characterization.\",\"PeriodicalId\":18930,\"journal\":{\"name\":\"Monthly Notices of the Royal Astronomical Society\",\"volume\":\"43 1\",\"pages\":\"\"},\"PeriodicalIF\":4.7000,\"publicationDate\":\"2024-09-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Monthly Notices of the Royal Astronomical Society\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://doi.org/10.1093/mnras/stae2079\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ASTRONOMY & ASTROPHYSICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Monthly Notices of the Royal Astronomical Society","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1093/mnras/stae2079","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
HD 21520 b: a warm sub-Neptune transiting a bright G dwarf
We report the discovery and validation of HD 21520 b, a transiting planet found with TESS and orbiting a bright G dwarf (V=9.2, Teff = 5871 ± 62 K, R⋆ = 1.04 ± 0.02 R⊙). HD 21520 b was originally alerted as a system (TOI-4320) consisting of two planet candidates with periods of 703.6 and 46.4 days. However, our analysis supports instead a single-planet system with an orbital period of 25.1292 ± 0.0001 days and radius of 2.70 ± 0.09 R⊕. Three full transits in sectors 4, 30 and 31 match this period and have transit depths and durations in agreement with each other, as does a partial transit in sector 3. We also observe transits using CHEOPS and LCOGT. SOAR and Gemini high-resolution imaging do not indicate the presence of any nearby companions, and Minerva-Australis and CORALIE radial velocities rule out an on-target spectroscopic binary. Additionally, we use ESPRESSO radial velocities to obtain a tentative mass measurement of $7.9^{+3.2}_{-3.0}\, M_{\hbox{$\oplus $}}$, with a 3-σ upper limit of 17.7 M⊕. Due to the bright nature of its host and likely significant gas envelope of the planet, HD 21520 b is a promising candidate for further mass measurements and for atmospheric characterization.
期刊介绍:
Monthly Notices of the Royal Astronomical Society is one of the world''s leading primary research journals in astronomy and astrophysics, as well as one of the longest established. It publishes the results of original research in positional and dynamical astronomy, astrophysics, radio astronomy, cosmology, space research and the design of astronomical instruments.