2023A&A...680A..78A

Query : 2023A&A...680A..78A

2023A&A...680A..78A - Astronomy and Astrophysics, volume 680A78 (2023/12-1)

No random transits in CHEOPS observations of HD 139139.

ALONSO R., HOYER S., DELEUIL M., SIMON A.E., BECK M., BENZ W., FLOREN H.-G., GUTERMAN P., BORSATO L., BRANDEKER A., GANDOLFI D., WILSON T.G., ZINGALES T., ALIBERT Y., ANGLADA G., BARCZY T., BARRADO NAVASCUES D., BARROS S.C.C., BAUMJOHANN W., BECK T., BILLOT N., BONFILS X., BROEG C., CHARNOZ S., COLLIER CAMERON A., CORRAL VAN DAMME C., CSIZMADIA S., CUBILLOS P.E., DAVIES M.B., DELINE A., DELREZ L., DEMANGEON O.D.S., DEMORY B.-O., EHRENREICH D., ERIKSON A., FORTIER A., FOSSATI L., FRIDLUND M., GILLON M., GUDEL M., GUNTHER M.N., HEITZMANN A., HELLING C., ISAAK K.G., KISS L.L., KOPP E., LAM K.W.F., LASKAR J., LECAVELIER DES ETANGS A., LENDL M., MAGRIN D., MAXTED P.F.L., MORDASINI C., NASCIMBENI V., OLOFSSON G., OTTENSAMER R., PAGANO I., PALLE E., PETER G., PIOTTO G., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RAUER H., RIBAS I., SANTOS N.C., SCANDARIATO G., SEGRANSAN D., SMITH A.M.S., SOUSA S.G., STALPORT M., SZABO G.M., THOMAS N., UDRY S., ULMER B., VAN GROOTEL V., VENTURINI J., VERRECCHIA F. and WALTON N.A.

Abstract (from CDS):

Context. The star HD 139139 (a.k.a. 'the Random Transiter') is a star that exhibited enigmatic transit-like features with no apparent periodicity in K2 data. The shallow depth of the events (∼200 ppm - equivalent to transiting objects with radii of ∼1.5 R⊕ in front of a Sun-like star) and their non-periodicity constitute a challenge for the photometric follow-up of this star.
Aims. The goal of this study is to confirm with independent measurements the presence of shallow, non-periodic transit-like features on this object.
Methods. We performed observations with CHEOPS for a total accumulated time of 12.75 days, distributed in visits of roughly 20 h in two observing campaigns in years 2021 and 2022. The precision of the data is sufficient to detect 150 ppm features with durations longer than 1.5 h. We used the duration and times of the events seen in the K2 curve to estimate how many events should have been detected in our campaigns, under the assumption that their behaviour during the CHEOPS observations would be the same as in the K2 data of 2017.
Results. We do not detect events with depths larger than 150 ppm in our data set. If the frequency, depth, and duration of the events were the same as in the K2 campaign, we estimate the probability of having missed all events due to our limited observing window would be 4.8%.
Conclusions. We suggest three different scenarios to explain our results: 1) Our observing window was not long enough, and the events were missed with the estimated 4.8% probability. 2) The events recorded in the K2 observations were time critical, and the mechanism producing them was either not active in the 2021 and 2022 campaigns or created shallower events under our detectability level. 3) The enigmatic events in the K2 data are the result of an unidentified and infrequent instrumental noise in the original data set or its data treatment.

Abstract Copyright: © The Authors 2023

Journal keyword(s): stars: peculiar - planets and satellites: detection - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/680/A78): 1min.dat 29min.dat 1orb.dat>

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 139139 PM* 15 37 06.2148672264 -19 08 33.084276144   10.389 9.84 9.47 9.654 G3/5V 21 0

Query : 2023A&A...680A..78A

Basic data :
HD 139139 -- High Proper Motion Star
Other object types: otypes_help 		* (HD,BD,...), NIR (DENIS,2MASS), PM* (2016A&A)
ICRS coord. (ep=J2000) : 		15 37 06.2148672264 -19 08 33.084276144 (Optical) [ 0.0136 0.0099 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		15 34 14.0219072587 -18 58 38.109657392 [ 0.0136 0.0099 90 ]
Gal coord. (ep=J2000) : 		348.3968092054146 +28.7501388523431 [ 0.0136 0.0099 90 ]
Proper motions mas/yr : 		-67.475 -92.600 [0.017 0.013 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 16.36 [0.40] / z(spectroscopic) 0.000055 [0.000001] / cz 16.36 [0.40]
   (Opt) A 2018yCat.1345....0G
Parallaxes (mas): 		9.3455 [0.0144] A 2020yCat.1350....0G
Spectral type: 		G3/5V D 1988MSS...C04....0H
Fluxes (8) :
B 10.389 [0.083] C 2014AJ....148...81M
V 9.84 [0.04] D 2000A&A...355L..27H
R 9.47 [~] E 2003AJ....125..984M
G 9.569325 [0.002762] C 2020yCat.1350....0G
I 9.654 [0.02] C 2005yCat.2263....0D
J 8.435 [0.029] C 2003yCat.2246....0C
H 8.101 [0.038] C 2003yCat.2246....0C
K 8.050 [0.031] C 2003yCat.2246....0C
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Hierarchy : number of linked objects
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: 1 		Display criteria :

Identifiers (15) :
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HD 139139 GSC 06193-00969 RAVE J153706.2-190833 Gaia DR2 6254212221163830016
BD-18 4107 2MASS J15370623-1908329 TIC 70652803 Gaia DR3 6254212221163830016
DENIS J153706.2-190832 PPM 717808 TYC 6193-969-1 Gaia DR1 6254212216862625024
EPIC 249706694 RAVE J153706.2-190832 USNO-B1.0 0708-00306171

References (21 between 1850 and 2026) (Total 21)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 6    Distance : 4    Rot : 2    Fe/H : 7    Plx : 5    PM : 2    SpT : 2   

   

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HD 139139 BD-18 4107 DENIS J153706.2-190832 GSC 06193-00969 2MASS J15370623-1908329
PPM 717808 RAVE J153706.2-190832 RAVE J153706.2-190833 TYC 6193-969-1 USNO-B1.0 0708-00306171
Gaia DR2 6254212221163830016 Gaia DR3 6254212221163830016 Gaia DR1 6254212216862625024

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