HD 21520 b: a warm sub-Neptune transiting a bright G dwarf
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| Format: | Preprint |
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2024
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| author | Nies, Molly Mireles, Ismael Bouchy, François Dragomir, Diana Nicholson, Belinda A. Eisner, Nora L. Sousa, Sergio G. Collins, Karen A. Howell, Steve B. Ziegler, Carl Hellier, Coel Addison, Brett Ballard, Sarah Bowler, Brendan P. Briceño, César Clark, Catherine A. Conti, Dennis M. Dumusque, Xavier Edwards, Billy Gnilka, Crystal L. Hobson, Melissa Horner, Jonathan Kane, Stephen R. Kielkopf, John Lavie, Baptiste Law, Nicholas Lendl, Monika Littlefield, Colin Liu, Huigen Mann, Andrew W. Mengel, Matthew W. Oddo, Dominic Okumura, Jack Palle, Enric Plavchan, Peter Psaridi, Angelica Santos, Nuno C. Schwarz, Richard P. Shporer, Avi Wittenmyer, Robert A. Wright, Duncan J. Zhang, Hui Watanabe, David Medina, Jennifer V. Villaseñor, Joel Ting, Eric B. Christiansen, Jessie L. Winn, Joshua N. Stassun, Keivan G. Seager, S. Latham, David W. Ricker, George R. |
| author_facet | Nies, Molly Mireles, Ismael Bouchy, François Dragomir, Diana Nicholson, Belinda A. Eisner, Nora L. Sousa, Sergio G. Collins, Karen A. Howell, Steve B. Ziegler, Carl Hellier, Coel Addison, Brett Ballard, Sarah Bowler, Brendan P. Briceño, César Clark, Catherine A. Conti, Dennis M. Dumusque, Xavier Edwards, Billy Gnilka, Crystal L. Hobson, Melissa Horner, Jonathan Kane, Stephen R. Kielkopf, John Lavie, Baptiste Law, Nicholas Lendl, Monika Littlefield, Colin Liu, Huigen Mann, Andrew W. Mengel, Matthew W. Oddo, Dominic Okumura, Jack Palle, Enric Plavchan, Peter Psaridi, Angelica Santos, Nuno C. Schwarz, Richard P. Shporer, Avi Wittenmyer, Robert A. Wright, Duncan J. Zhang, Hui Watanabe, David Medina, Jennifer V. Villaseñor, Joel Ting, Eric B. Christiansen, Jessie L. Winn, Joshua N. Stassun, Keivan G. Seager, S. Latham, David W. Ricker, George R. |
| contents | 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, $T_{eff} = 5871 \pm 62$ K, $R_{\star} = 1.04\pm 0.02\, R_{\odot}$). 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 $25.1292\pm0.0001$ days and radius of $2.70 \pm 0.09\, R_{\oplus}$. 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 $7.9^{+3.2}_{-3.0}\, M_{\oplus}$, with a 3-$σ$ upper limit of 17.7 $M_{\oplus}$. 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_09595 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | HD 21520 b: a warm sub-Neptune transiting a bright G dwarf Nies, Molly Mireles, Ismael Bouchy, François Dragomir, Diana Nicholson, Belinda A. Eisner, Nora L. Sousa, Sergio G. Collins, Karen A. Howell, Steve B. Ziegler, Carl Hellier, Coel Addison, Brett Ballard, Sarah Bowler, Brendan P. Briceño, César Clark, Catherine A. Conti, Dennis M. Dumusque, Xavier Edwards, Billy Gnilka, Crystal L. Hobson, Melissa Horner, Jonathan Kane, Stephen R. Kielkopf, John Lavie, Baptiste Law, Nicholas Lendl, Monika Littlefield, Colin Liu, Huigen Mann, Andrew W. Mengel, Matthew W. Oddo, Dominic Okumura, Jack Palle, Enric Plavchan, Peter Psaridi, Angelica Santos, Nuno C. Schwarz, Richard P. Shporer, Avi Wittenmyer, Robert A. Wright, Duncan J. Zhang, Hui Watanabe, David Medina, Jennifer V. Villaseñor, Joel Ting, Eric B. Christiansen, Jessie L. Winn, Joshua N. Stassun, Keivan G. Seager, S. Latham, David W. Ricker, George R. Earth and Planetary Astrophysics 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, $T_{eff} = 5871 \pm 62$ K, $R_{\star} = 1.04\pm 0.02\, R_{\odot}$). 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 $25.1292\pm0.0001$ days and radius of $2.70 \pm 0.09\, R_{\oplus}$. 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 $7.9^{+3.2}_{-3.0}\, M_{\oplus}$, with a 3-$σ$ upper limit of 17.7 $M_{\oplus}$. 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. |
| title | HD 21520 b: a warm sub-Neptune transiting a bright G dwarf |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2406.09595 |