The HD 93963 A transiting system: A 1.04 d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS
Article
Article Title | The HD 93963 A transiting system: A 1.04 d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS |
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Article Category | Article |
Authors | Serrano, L. M., Gandolfi, D., Hoyer, S., Brandeker, A., Hooton, M. J., Sousa, S., Murgas, F., Ciardi, D. R., Howell, S. B., Benz, W., Billot, N., Floren, H.-G., Bekkelien, A., Bonfanti, A., Krenn, A., Mustill, A. J., Wilson, T. G., Osborn, H., Parviainen, H., Heidari, N., Palle, E., Fridlund, M., Adibekyan, V., Fossati, L., Deleuil, M., Knudstrup, E., Collins, K. A., Lam, K. W. F., Grziwa, S., Salmon, S., Albrecht, S., Alibert, Y., Alonso, R., Anglada-Escude, G., Barczy, T., Barrado Y Navascues, D., Barros, S., Baumjohann, W., Beck, M., Beck, T., Bieryla, A., Bonfils, X., Boyd, P. T., Broeg, C., Cabrera, J., Charnoz, S., Chazelas, B., Christiansen, J., Collier Cameron, A., Cortés-Zuleta, P., Csizmadia, Sz., Davies, M. B., Deline, A., Delrez, L., Demangeon, O. D. S., Demory, B. -O., Dunlavey, A., Ehrenreich, D., Erikson, A., Fortier, A., Fukui, A., Garai, Z., Gillon, M., Gudel, M., Hebrard, G., Heng, K., Huang, C. X., Isaak, K. G., Jenkins, J. M., Kiss, L. L., Laskar, J., Latham, D. W., Lecavelier des Etangs, A., Lendl, M., Levine, A., Lovis, C., Lund, M. B., Magrin, D., Maxted, P. F. L., Narita, N., Nascimbeni, V., Olofsson, G., Ottensamer, R., Pagano, I., Pessanha, A. C. S. V., Peter, G., Piotto, G., Pollacco, D., Queloz, D., Ragazzoni, R., Rando, N., Ratti, F., Rauer, H., Ribas, I., Ricker, G., Rowden, P., Santos, N., Scandariato, G., Seager, S., Segransan, D., Simon, A., Smith, A. M. S., Steller, M., Szabo, G., Thomas, N., Twicken, J. D., Udry, S., Ulmer, B., Van Grootel, V., Vanderspek, R., Viotto, V. and Walton, N. |
Journal Title | Astronomy and Astrophysics |
Journal Citation | 667, p. A1 |
Number of Pages | A1 |
Year | 2022 |
01 Nov 2022 | |
Place of Publication | United States |
Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/202243093 |
Web Address (URL) | https://www.aanda.org/articles/aa/full_html/2022/11/aa43093-22/aa43093-22.html |
Abstract | We present the discovery of two small planets transiting HD 93963A (TOI-1797), a GOV star (M* = 1.109 ± 0.043M⊙, R* = 1.043 ± 0.009 R⊙) in a visual binary system. We combined TESS and CHEOPS space-borne photometry with MuSCAT 2 ground-based photometry, ‘Alopeke and PHARO high-resolution imaging, TRES and FIES reconnaissance spectroscopy, and SOPHIE radial velocity measurements. We validated and spectroscopically confirmed the outer transiting planet HD 93963 A c, a sub-Neptune with an orbital period of Pc ≈ 3.65 d that was reported to be a TESS object of interest (TOI) shortly after the release of Sector 22 data. HD 93963 A c has amass of Mc = 19.2 ± 4.1 M⊕ and a radius of Rc = 3.228 ± 0.059 R⊕, implying a mean density of ρc = 3.1 ± 0.7 g cm-3. The inner object, HD 93963 A b, is a validated 1.04 d ultra-short period (USP) transiting super-Earth that we discovered in the TESS light curve and that was not listed as a TOI, owing to the low significance of its signal (TESS signal-to-noise ratio ≈6.7, TESS + CHEOPS combined transit depth Db = 141.5−8.3+8.5 ppm). We intensively monitored the star with CHEOPS by performing nine transit observations to confirm the presence of the inner planet and validate the system. HD 93963 A b is the first small (Rb = 1.35 ± 0.042 R⊕) USP planet discovered and validated by TESS and CHEOPS. Unlike planet c, HD 93963 Ab is not significantly detected in our radial velocities (Mb = 7.8 ± 3.2 M⊕). The two planets are on either side of the radius valley, implying that they could have undergone completely different evolution processes. We also discovered a linear trend in our Doppler measurements, suggesting the possible presence of a long-period outer planet. With a V-band magnitude of 9.2, HD 93963 A is among the brightest stars known to host a USP planet, making it one of the most favourable targets for precise mass measurement via Doppler spectroscopy and an important laboratory to test formation, evolution, and migration models of planetary systems hosting ultra-short period planets. |
Keywords | planets and satellites: detection; planets and satellites: |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Byline Affiliations | University of Turin, Italy |
Aix-Marseille University, France | |
Stockholm University, Sweden | |
University of Bern, Switzerland | |
University of Porto, Portugal | |
University of La Laguna, Spain | |
NASA Exoplanet Science Institute, United States | |
NASA Ames Research Center, United States | |
University of Geneva, Switzerland | |
Austrian Academy of Sciences, Austria | |
Lund University, Sweden | |
University of St Andrews, United Kingdom | |
Massachusetts Institute of Technology, United States | |
Institute of Astrophysics of the Canary Islands, Spain | |
Shahid Beheshti University, Iran | |
Cote d'Azur Observatory, France | |
Leiden University, Netherlands | |
Chalmers University of Technology, Sweden | |
Aarhus University, Denmark | |
Nordic Optical Telescope, Spain | |
Center for Astrophysics Harvard and Smithsonian, United States | |
German Aerospace Centre, Germany | |
University of Cologne, Germany | |
Autonomous University of Barcelona, Spain | |
National Institute of Physical Education of Catalonia, Spain | |
Admatis, Hungary | |
European Space Astronomy Centre, Spain | |
Grenoble Alpes University, France | |
NASA Goddard Space Flight Center, United States | |
University of Paris, France | |
University of Liege, Belgium | |
University of California, United States | |
University of Tokyo, Japan | |
Slovak Academy of Sciences, Slovakia | |
MTA-ELTE Exoplanet Research Group, Hungary | |
Eotvos Lorand University (ELTE), Hungary | |
University of Vienna, Austria | |
Pierre and Marie Curie University, France | |
University of Warwick, United Kingdom | |
European Space Research and Technology Centre (ESTEC), Netherlands | |
Konkoly Observatory, Hungary | |
Sorbonne University, France | |
INAF - Astronomical Observatory of Padova, Italy | |
Keele University, United Kingdom | |
Astrobiology Center, Japan | |
INAF - Catania Astrophysical Observatory, Italy | |
No affiliation | |
University of Padua, Italy | |
Swiss Federal Institute of Technology, Switzerland | |
Cavendish Laboratory, United Kingdom | |
Technical University of Berlin, Germany | |
Free University of Berlin, Germany | |
Royal Astronomical Society, United Kingdom | |
University of Cambridge, United Kingdom |
https://research.usq.edu.au/item/yy949/the-hd-93963-a-transiting-system-a-1-04-d-super-earth-and-a-3-65-d-sub-neptune-discovered-by-tess-and-cheops
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