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. H., Alibert, Y., Alonso, R., Anglada-Escude, G., Barczy, T., Barrado y Navascues, D., Barros, S. C. C., Baumjohann, W., Beck, M., Beck, T., Bieryla, A., Bonfils, X., Boyd, P. T., Broeg, C., Cabrera, J., Charnoz, S., Chazelas, B., Christiansen, J. L., Cameron, A. Collier, Cortes-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., des Etangs, A. Lecavelier, Lendl, M., Levine, A. M., 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. C., Scandariato, G., Seager, S., Segransan, D., Simon, A. E., Smith, A. M. S., Steller, M., Szabo, Gy M., Thomas, N., Twicken, J. D., Udry, S., Ulmer, B., Van Grootel, V., Vanderspek, R., Viotto, V. and Walton, N. (2022). The HD 93963 A transiting system: A 1.04 d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS. Astron. Astrophys., 667. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We present the discovery of two small planets transiting HD 93963A (TOI-1797), a GOV star (M-* = 1.109 +/- 0.043M(circle dot), R-* = 1.043 +/- 0.009 R-circle dot) 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 P-c approximate to 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 M-c = 19.2 +/- 4.1 M-circle plus and a radius of R-c = 3.228 +/- 0.059 R-circle plus, implying a mean density of rho(c) = 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 approximate to 6.7, TESS + CHEOPS combined transit depth D-b = 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 (R-b = 1.35 +/- 0.042 R-circle plus) USP planet discovered and validated by TESS and CHEOPS. Unlike planet c, HD 93963 Ab is not significantly detected in our radial velocities (M-b = 7.8 +/- 3.2 M-circle plus). 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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Serrano, L. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hoyer, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Brandeker, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hooton, M. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sousa, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Murgas, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ciardi, D. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Howell, S. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Benz, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Billot, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Floren, H-GUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bekkelien, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonfanti, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Krenn, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mustill, A. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wilson, T. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Osborn, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Parviainen, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heidari, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Palle, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fridlund, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Adibekyan, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fossati, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deleuil, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Knudstrup, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Collins, K. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lam, K. W. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grziwa, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Salmon, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Albrecht, S. H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alibert, Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alonso, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Anglada-Escude, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barczy, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barrado y Navascues, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Barros, S. C. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Baumjohann, W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beck, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beck, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bieryla, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bonfils, X.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Boyd, P. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Broeg, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cabrera, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Charnoz, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chazelas, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Christiansen, J. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cameron, A. CollierUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cortes-Zuleta, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csizmadia, SzUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Davies, M. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deline, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Delrez, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Demangeon, O. D. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Demory, B-OUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dunlavey, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ehrenreich, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fortier, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fukui, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garai, Z.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gillon, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gudel, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hebrard, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heng, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Huang, C. X.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Isaak, K. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jenkins, J. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kiss, L. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Laskar, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Latham, D. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
des Etangs, A. LecavelierUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lendl, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Levine, A. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lovis, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lund, M. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Magrin, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Maxted, P. F. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Narita, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nascimbeni, VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Olofsson, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ottensamer, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pagano, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pessanha, A. C. S., VUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peter, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Piotto, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pollacco, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Queloz, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ragazzoni, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rando, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ratti, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauer, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ribas, IUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ricker, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rowden, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Santos, N. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scandariato, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Seager, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Segransan, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Simon, A. E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Smith, A. M. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Steller, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Szabo, Gy M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Thomas, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Twicken, J. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Udry, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ulmer, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van Grootel, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vanderspek, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Viotto, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Walton, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-699255
DOI: 10.1051/0004-6361/202243093
Journal or Publication Title: Astron. Astrophys.
Volume: 667
Date: 2022
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
LOW-MASS STARS; RADIAL-VELOCITY; PLANET CANDIDATES; ERROR-CORRECTION; STELLAR ACTIVITY; ADAPTIVE OPTICS; LIGHT CURVES; KEPLER; EXOPLANETS; ROTATIONMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/69925

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