دورية أكاديمية
No random transits in CHEOPS observations of HD 139139
| العنوان: | No random transits in CHEOPS observations of HD 139139 |
|---|---|
| المؤلفون: | Alonso, R., Hoyer, S., Deleuil, M., Simon, A. E., Beck, M., Benz, W., Florén, H. -G., Guterman, P., Borsato, L., Brandeker, A., Gandolfi, D., Wilson, T. G., Zingales, T., Alibert, Y., Anglada, G., Bárczy, T., Barrado Navascues, D., S. C. C. Barros, Baumjohann, W., Beck, T., Billot, N., Bonfils, X., Broeg, Ch., Charnoz, S., Collier Cameron, A., Corral van Damme, C., Sz., Csizmadia, Cubillos, P. E., Davies, M. B., Deline, A., Delrez, Laetitia, O. D. S. Demangeon, Demory, B. -O., Ehrenreich, D-, Erikson, A., Fortier, A., Fossati, L., Fridlund, M., Gillon, Michaël, Güdel, M., Günther, M. N., Heitzmann, A., Helling, Ch., Isaak, K. G., Kiss, L. L., Kopp, E., K. W. F. Lam, Laskar, J., Lecavelier des Etangs, A., Lendl, M., Magrin, D., P. F. L. Maxted, Mordasini, Ch., Nascimbeni, V., Olofsson, G., Ottensamer, R., Pagano, I., Pallé, E., Peter, G., Piotto, G., Pollacco, D., Queloz, D., Ragazzoni, R., Rando, N., Rauer, H., Ribas, I., Santos, N. C., Scandariato, G., Ségransan, D., A. M. S. Smith, Sousa, S. G., Stalport, Manu, Szabó, Gy. M., Thomas, N., Udry, S., Ulmer, B., Van Grootel, Valérie, Venturini, J., Verrecchia, F., Walton, N. A. |
| المصدر: | Astronomy and Astrophysics, 680, A78 (2023-12) |
| بيانات النشر: | EDP Sciences, 2023. |
| سنة النشر: | 2023 |
| مصطلحات موضوعية: | astro-ph.EP, astro-ph.SR, Space and Planetary Science, Astronomy and Astrophysics, Physical, chemical, mathematical & earth Sciences, Space science, astronomy & astrophysics, Physique, chimie, mathématiques & sciences de la terre, Aérospatiale, astronomie & astrophysique |
| الوصف: | HD 139139 (a.k.a. 'The Random Transiter') is a star that exhibited enigmatictransit-like features with no apparent periodicity in K2 data. The shallowdepth of the events ($\sim$200 ppm -- equivalent to transiting objects withradii of $\sim$1.5 R$_\oplus$ in front of a Sun-like star), and theirnon-periodicity, constitutes a challenge for the photometric follow-up of thisstar. The goal of this study is to confirm with independent measurements thepresence of shallow, non-periodic transit-like features on this object. Weperformed observations with CHEOPS, for a total accumulated time of 12.75 d,distributed in visits of roughly 20 h in two observing campaigns in years 2021and 2022. The precision of the data is sufficient to detect 150 ppm featureswith durations longer than 1.5 h. We use the duration and times of the eventsseen in the K2 curve to estimate how many should have been detected in ourcampaigns, under the assumption that their behaviour during the CHEOPSobservations would be the same as in the K2 data of 2017. We do not detectevents 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, weestimate the probability of having missed all events due to our limitedobserving window would be 4.8 %. We suggest three different scenarios toexplain our results: 1) Our observing window was not long enough, and theevents were missed with the estimated 4.8 % probability. 2) The events recordedin the K2 observations were time critical, and the mechanism producing them waseither not active in the 2021 and 2022 campaigns or created shallower eventsunder our detectability level. 3) The enigmatic events in the K2 data are theresult of an unidentified and infrequent instrumental noise in the originaldata set or its data treatment. |
| نوع الوثيقة: | journal article http://purl.org/coar/resource_type/c_6501Test article peer reviewed |
| اللغة: | English |
| العلاقة: | https://www.aanda.org/10.1051/0004-6361/202347779/pdfTest; urn:issn:0004-6361; urn:issn:1432-0746 |
| DOI: | 10.1051/0004-6361/202347779 |
| الوصول الحر: | https://orbi.uliege.be/handle/2268/310094Test |
| حقوق: | open access http://purl.org/coar/access_right/c_abf2Test info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsorb.310094 |
| قاعدة البيانات: | ORBi |
| DOI: | 10.1051/0004-6361/202347779 |
|---|