A full transit of v 2Lupi d and the search for an exomoon in its Hill sphere with CHEOPS
(2023) In Astronomy and Astrophysics 671.- Abstract
- The planetary system around the naked-eye star v2 Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses (M⊕). 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 M⊕ exoplanet v2 Lup d with the CHEOPS space telescope. We confirmed its transiting nature by covering its whole 9.1 h transit for the first time. We refined the planet transit ephemeris to P = 107.13610.0022+0.0019 days and Tc = 2459009.77590.0096+0.0101 BJDTDB, improving by ~40 times on the... (More)
- The planetary system around the naked-eye star v2 Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses (M⊕). 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 M⊕ exoplanet v2 Lup d with the CHEOPS space telescope. We confirmed its transiting nature by covering its whole 9.1 h transit for the first time. We refined the planet transit ephemeris to P = 107.13610.0022+0.0019 days and Tc = 2459009.77590.0096+0.0101 BJDTDB, 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 v2 Lup d transits will warrant a comprehensive search for a moon around this outstanding exoplanet. © 2023 The Authors. (Less)
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- author
- Ehrenreich, D. ; Davies, M.B. LU and Walton, N.A.
- author collaboration
- organization
- publishing date
- 2023-03
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Planets and satellites: detection, Planets and satellites: general, Planets and satellites: individual: HD 136352, Earth (planet), Extrasolar planets, Satellites, Earth mass, Exo-planets, Follow up, Naked-eye, Planet and satellite: individual: HD 136352, Planetary system, Planets and satellites: detections, Planets and satellites: individual, Straddlings, Spheres
- in
- Astronomy and Astrophysics
- volume
- 671
- article number
- A154
- publisher
- EDP Sciences
- external identifiers
-
- scopus:85150788165
- ISSN
- 0004-6361
- DOI
- 10.1051/0004-6361/202244790
- language
- English
- LU publication?
- yes
- id
- 0e4176f6-7e79-4435-98ed-c785c59c461f
- date added to LUP
- 2023-10-31 10:57:20
- date last changed
- 2023-10-31 10:57:20
@article{0e4176f6-7e79-4435-98ed-c785c59c461f,
abstract = {{The planetary system around the naked-eye star v2 Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses (M⊕). 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 M⊕ exoplanet v2 Lup d with the CHEOPS space telescope. We confirmed its transiting nature by covering its whole 9.1 h transit for the first time. We refined the planet transit ephemeris to P = 107.13610.0022+0.0019 days and Tc = 2459009.77590.0096+0.0101 BJDTDB, 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 v2 Lup d transits will warrant a comprehensive search for a moon around this outstanding exoplanet. © 2023 The Authors.}},
author = {{Ehrenreich, D. and Davies, M.B. and Walton, N.A.}},
issn = {{0004-6361}},
keywords = {{Planets and satellites: detection; Planets and satellites: general; Planets and satellites: individual: HD 136352; Earth (planet); Extrasolar planets; Satellites; Earth mass; Exo-planets; Follow up; Naked-eye; Planet and satellite: individual: HD 136352; Planetary system; Planets and satellites: detections; Planets and satellites: individual; Straddlings; Spheres}},
language = {{eng}},
publisher = {{EDP Sciences}},
series = {{Astronomy and Astrophysics}},
title = {{A full transit of v 2Lupi d and the search for an exomoon in its Hill sphere with CHEOPS}},
url = {{http://dx.doi.org/10.1051/0004-6361/202244790}},
doi = {{10.1051/0004-6361/202244790}},
volume = {{671}},
year = {{2023}},
}