2023A&A...669A..64D

Query : 2023A&A...669A..64D

2023A&A...669A..64D - Astronomy and Astrophysics, volume 669A64 (2023/1-1)

55 Cancri e's occultation captured with CHEOPS,.

DEMORY B.-O., SULIS S., MEIER VALDES E., DELREZ L., BRANDEKER A., BILLOT N., FORTIER A., HOYER S., SOUSA S.G., HENG K., LENDL M., KRENN A., MORRIS B.M., PATEL J.A., ALIBERT Y., ALONSO R., ANGLADA G., BARCZY T., BARRADO D., BARROS S.C.C., BAUMJOHANN W., BECK M., BECK T., BENZ W., BONFILS X., BROEG C., BUDER M., CABRERA J., CHARNOZ S., COLLIER CAMERON A., COTTARD H., CSIZMADIA S., DAVIES M.B., DELEUIL M., DEMANGEON O.D.S., EHRENREICH D., ERIKSON A., FOSSATI L., FRIDLUND M., GANDOLFI D., GILLON M., GUDEL M., ISAAK K.G., KISS L.L., LASKAR J., LECAVELIER DES ETANGS A., LOVIS C., LUNTZER A., MAGRIN D., MARAFATTO L., MAXTED P.F.L., NASCIMBENI V., OLOFSSON G., OTTENSAMER R., PAGANO I., PALLE E., PETER G., PIOTTO G., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RATTI F., RAUER H., RIBAS I., SANTOS N.C., SCANDARIATO G., SEGRANSAN D., SIMON A.E., SMITH A.M.S., STELLER M., SZABO G.M., THOMAS N., UDRY S., VAN GROOTEL V. and WALTON N.A.

Abstract (from CDS):

Past occultation and phase-curve observations of the ultra-short period super-Earth 55 Cnc e obtained at visible and infrared wavelengths have been challenging to reconcile with a planetary reflection and emission model. In this study, we analyse a set of 41 occultations obtained over a two-year timespan with the CHEOPS satellite. We report the detection of 55 Cnc e's occultation with an average depth of 12 ± 3 ppm. We derive a corresponding 2σ upper limit on the geometric albedo of A_g < 0.55 once decontaminated from the thermal emission measured by Spitzer at 4.5 µm. CHEOPS's photometric performance enables, for the first time, the detection of individual occultations of this super-Earth in the visible and identifies short-timescale photometric corrugations likely induced by stellar granulation. We also find a clear 47.3-day sinusoidal pattern in the time-dependent occultation depths that we are unable to relate to stellar noise, nor instrumental systematics, but whose planetary origin could be tested with upcoming JWST occultation observations of this iconic super-Earth.

Abstract Copyright: © The Authors 2023

Journal keyword(s): planets and satellites: individual: 55 Cnc e - techniques: photometric - methods: observational

VizieR on-line data: <Available at CDS (J/A+A/669/A64): raw.dat detrend.dat>

Simbad objects: 6

Full paper

View the references in ADS

Number of rows : 6

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	* 53 Cnc	LP?	08 52 28.5899126304	+28 15 32.968291068	9.35	7.85	6.23		M3III	61	0
2	* rho01 Cnc	PM*	08 52 35.8111044043	+28 19 50.954994470	7.45	6.82		5.4	K0IV-V	1223	1
3	* rho01 Cnc e	Pl	08 52 35.8111044043	+28 19 50.954994470					~	682	1
4	* rho01 Cnc c	Pl	08 52 35.8111044043	+28 19 50.954994470					~	154	1
5	NAME L 119-213b	Pl	22 41 58.1171811377	-69 10 08.320741850					~	146	0
6	K2-141b	Pl	23 23 39.9709098120	-01 11 21.448681332					~	104	0

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