J/other/NatAs/5.775 nu2 Lupi CHEOPS light curves (Delrez+, 2021)
Transit detection of the long-period volatile-rich super-Earth nu2 Lupi d
with CHEOPS.
Delrez L., Ehrenreich D., Alibert Y., Bonfanti A., Borsato L., Fossati L.,
Hooton M.J., Hoyer S., Pozuelos F.J., Salmon S., Sulis S., Wilson T.G.,
Adibekyan V., Bourrier V., Brandeker A., Charnoz S., Deline A., Guterman P.,
Haldemann J., Hara N., Oshagh M., Sousa S.G., Van Grootel V., Alonso R.,
Anglada-Escude G., Barczy T., Barrado D., Barros S.C.C., Baumjohann W.,
Beck M., Bekkelien A., Benz W., Billot N., Bonfils X., Broeg C., Cabrera J.,
Collier Cameron A., Davies M.B., Deleuil M., Delisle J.-B.,
Demangeon O.D.S., Demory B.-O., Erikson A., Fortier A., Fridlund M.,
Futyan D., Gandolfi D., Garcia Munoz A., Gillon M., Guedel M., Heng K.,
Kiss L., Laskar J., Lecavelier des Etangs A., Lendl M., Lovis C.,
Maxted P.F.L., Nascimbeni V., Olofsson G., Osborn H.P., Pagano I., Palle E.,
Piotto G., Pollacco D., Queloz D., Rauer H., Ragazzoni R., 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., Walton N.A.
<Nature Astronomy, 5, 775-787 (2021)>
=2021NatAs...5..775D 2021NatAs...5..775D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry
Abstract:
Exoplanets transiting bright nearby stars are key objects for
advancing our knowledge of planetary formation and evolution. The
wealth of photons from the host star gives detailed access to the
atmospheric, interior and orbital properties of the planetary
companions. nu2 Lupi (HD 136352) is a naked-eye (V=5.78) Sun-like
star that was discovered to host three low-mass planets with orbital
periods of 11.6, 27.6 and 107.6d via radial-velocity monitoring. The
two inner planets (b and c) were recently found to transit2, prompting
a photometric follow-up by the brand new Characterising Exoplanets
Satellite (CHEOPS). Here, we report that the outer planet d is also
transiting, and measure its radius and mass to be
2.56±0.09R⊕ and 8.82±0.94M⊕, respectively. With
its bright Sun-like star, long period and mild irradiation (∼5.7 times
the irradiation of Earth), nu2 Lupi d unlocks a completely new
region in the parameter space of exoplanets amenable to detailed
characterization. We refine the properties of all three planets:
planet b probably has a rocky mostly dry composition, while planets c
and d seem to have retained small hydrogen-helium envelopes and a
possibly large water fraction. This diversity of planetary
compositions makes the nu2 Lupi system an excellent laboratory for
testing formation and evolution models of low-mass planets.
Description:
Six observation runs (visits) were obtained with CHEOPS between 4
April and 6 July 2020, targeting four transits of planet b and three
of planet c (the last visit contained one transit of each planet).
We present the raw and detrended CHEOPS light curves (6 visits).
Objects:
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RA (2000) DE Designation(s)
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15 21 48.151 -48 19 03.46 nu.02 Lup = HD 136352
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
vis1raw.dat 188 534 CHEOPS visit 1 raw data, planet b
vis1det.dat 60 526 CHEOPS visit 1 detrended fluxes, planet b
vis2raw.dat 188 544 CHEOPS visit 2 raw data, planet c
vis2det.dat 60 538 CHEOPS visit 2 detrended fluxes, planet c
vis3raw.dat 188 551 CHEOPS visit 3 raw data, planet b
vis3det.dat 60 545 CHEOPS visit 3 detrended fluxes, planet b
vis4raw.dat 188 628 CHEOPS visit 4 raw data, planet b
vis4det.dat 60 611 CHEOPS visit 4 detrended fluxes, planet b
vis5raw.dat 188 518 CHEOPS visit 5 raw data, planets c and d
vis5det.dat 60 504 CHEOPS visit 5 detrended fluxes, planets c and d
vis6raw.dat 188 472 CHEOPS visit 6 raw data, planets b and c
vis6det.dat 60 466 CHEOPS visit 6 detrended fluxes, planets b and c
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Byte-by-byte Description of file: vis?raw.dat
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Bytes Format Units Label Explanations
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1- 18 F18.10 d BJD Barycentric Julian Date (TDB)
20- 37 F18.16 --- Flux Raw normalised flux
39- 60 E22.16 --- e_Flux Error on the raw normalised flux
62- 74 F13.10 pix Xshift Target position offset in x-direction
76- 86 F11.8 pix Yshift Target position offset in y-direction
88-106 F19.15 deg RollAngle Roll angle
108-129 F22.20 --- Cont Flux contaminants/Flux target
131-151 F21.10 --- Bckg Background in the aperture
153-174 E22.16 --- Smearing Smearing in the aperture
176-188 F13.10 deg DeltaT Offset of the telescope temperature
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Byte-by-byte Description of file: vis?det.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 F18.10 d BJD Barycentric Julian Date (TDB)
20- 37 F18.16 --- Flux Detrended normalised flux
39- 60 E22.16 --- e_Flux Error on the detrended normalised flux
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Acknowledgements:
Laetitia Delrez, ldelrez(at)uliege.be
(End) Patricia Vannier [CDS] 06-Jul-2021