J/A+A/671/A154 A full transit of nu.02 Lup d (Ehrenreich+, 2023)
A full transit of nu2 Lupi d and the search for an exomoon in its Hill sphere
with CHEOPS.
Ehrenreich D., Delrez L., Akinsanmi B., Wilson T.G., Bonfanti A., Beck M.,
Benz W., Hoyer S., Queloz D., Alibert Y., Charnoz S., Collier Cameron A.,
Deline A., Hooton M., Lendl M., Olofsson G., Sousa S.G., Adibekyan V.,
Alonso R., Anglada G., Barrado D., Barros S.C.C., Baumjohann W., Beck T.,
Bekkelien A., Bergomi M., Billot N., Bonfils X., Brandeker A., Broeg C.,
Barczy T., Berta-Thompson Z.K., Cabrera J., Corral Van Damme C.,
Csizmadia S., Davies M.B., Deleuil M., Demangeon O., Demory B.-O.,
Doty J.P., Erikson A., Fausnaugh M.M., Floren H.-G., Fortier A.,
Fossati L., Fridlund M., Futyan D., Gandolfi D., Gillon M., Guterman P.,
Guedel M., Heng K., Isaak K.G., Jaeckel A., Jenkins J.M., Kiss L.L.,
Laskar J., Latham D.W., Lecavelier des Etangs A., Levine A.M., Lovis C.,
Magrin D., Maxted P.F.L., Morgan E.H., Nascimbeni V., Osborn H.P.,
Ottensamer R., Pagano I., Palle E., Peter G., Piotto G., Pollacco D.,
Ragazzoni R., Rando N., Rauer H., Ribas I., Ricker G.R., Salmon S.,
Santos N.C., Scandariato G., Simon A.E., Smith A.M.S., Steinberger M.,
Steller M., Szabo G.M., Segransan D., Shporer A., Thomas N.,
Tschentscher M., Udry S., Vanderspek R., Van Grootel V., Walton N.A.
<Astron. Astrophys. 671, A154 (2023)>
=2023A&A...671A.154E 2023A&A...671A.154E (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry ; Optical
Keywords: planets and satellites: detection -
planets and satellites: individual: HD 136352 -
planets and satellites: general
Abstract:
The planetary system around the naked-eye star nu.02 Lup (HD 136352;
TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2 and
8.6 Earth masses. The TESS and CHEOPS missions revealed that all three
planets are transiting and have radii straddling the radius gap
separating volatile-rich and volatile-poor super-earths. Only a
partial transit of planet d had been covered so we re-observed an
inferior conjunction of the long-period 8.6 Earth mass exoplanet
nu.02 Lup d with the CHEOPS space telescope. We confirmed its
transiting nature by covering its whole 9.1h transit for the first
time. We refined the planet transit ephemeris to
P=107.1361+0.0019-0.0022 days and
Tc=2459009.7759+0.0101-0.0096 BJD_TDB, improving by ∼40 times on
the previously reported transit timing uncertainty. This refined
ephemeris will enable further follow-up of this outstanding
long-period transiting planet to search for atmospheric signatures or
explore the planet's Hill sphere in search for an exomoon. In fact,
the CHEOPS observations also cover the transit of a large fraction of
the planet's Hill sphere, which is as large as the Earth's, opening
the tantalising possibility of catching transiting exomoons. We
conducted a search for exomoon signals in this single-epoch light
curve but found no conclusive photometric signature of additional
transiting bodies larger than Mars. Yet, only a sustained follow-up of
nu.02 Lup d transits will warrant a comprehensive search for a moon
around this outstanding exoplanet.
Description:
One 92.11h-long CHEOPS visit of HD 136352 (nu.02 Lup) was acquired on
2021-04-24, targetting a transit of planet d. This catalogue contains
the automatically-reduced CHEOPS light curve (displayed in the paper,
Fig. 2, upper panel) as well as the detrended CHEOPS light curve
(Fig. 2, middle panel).
Objects:
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RA (2000) DE Designation(s)
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15 21 48.18 -48 19 03.38 nu.02 Lup = TOI-2011 = HD 136352
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
detrend.dat 60 4378 HD 136352 detrended CHEOPS light curve
reduced.dat 60 4378 HD 136352 automatically-reduced CHEOPS light curve
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See also:
J/AJ/160/129 : HD 136352 HARPS, HIRES and AAT radial velocities (Kane+, 2020)
Byte-by-byte Description of file: detrend.dat reduced.dat
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Bytes Format Units Label Explanations
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1- 18 F18.10 --- Time Time (BJD_TDB)
20- 37 F18.16 --- NFlux Normalised flux
39- 60 E22.16 --- e_NFlux Uncertainty (1sigma) on normalised flux
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History:
From David Ehrenreich, david.ehrenreich(at)unige.ch
Acknowledgements:
CHEOPS is a European Space Agency (ESA) mission in partnership with
Switzerland with important contributions to the payload and the ground
segment from Austria, Belgium, France, Germany, Hungary, Italy,
Portugal, Spain, Sweden and the United Kingdom.
(End) Patricia Vannier [CDS] 06-Jan-2023