Early 2017 observations of TRAPPIST-1 with Spitzer. Issue 3 (9th January 2018)
- Record Type:
- Journal Article
- Title:
- Early 2017 observations of TRAPPIST-1 with Spitzer. Issue 3 (9th January 2018)
- Main Title:
- Early 2017 observations of TRAPPIST-1 with Spitzer
- Authors:
- Delrez, L
Gillon, M
Triaud, A H M J
Demory, B-O
de Wit, J
Ingalls, J G
Agol, E
Bolmont, E
Burdanov, A
Burgasser, A J
Carey, S J
Jehin, E
Leconte, J
Lederer, S
Queloz, D
Selsis, F
Van Grootel, V - Abstract:
- Abstract: The recently detected TRAPPIST-1 planetary system, with its seven planets transiting a nearby ultracool dwarf star, offers the first opportunity to perform comparative exoplanetology of temperate Earth-sized worlds. To further advance our understanding of these planets' compositions, energy budgets, and dynamics, we are carrying out an intensive photometric monitoring campaign of their transits with the Spitzer Space Telescope . In this context, we present 60 new transits of the TRAPPIST-1 planets observed with Spitzer /Infrared Array Camera (IRAC) in 2017 February and March. We combine these observations with previously published Spitzer transit photometry and perform a global analysis of the resulting extensive data set. This analysis refines the transit parameters and provides revised values for the planets' physical parameters, notably their radii, using updated properties for the star. As part of our study, we also measure precise transit timings that will be used in a companion paper to refine the planets' masses and compositions using the transit timing variations method. TRAPPIST-1 shows a very low level of low-frequency variability in the IRAC 4.5-μm band, with a photometric RMS of only 0.11 per cent at a 123-s cadence. We do not detect any evidence of a (quasi-)periodic signal related to stellar rotation. We also analyse the transit light curves individually, to search for possible variations in the transit parameters of each planet due to stellarAbstract: The recently detected TRAPPIST-1 planetary system, with its seven planets transiting a nearby ultracool dwarf star, offers the first opportunity to perform comparative exoplanetology of temperate Earth-sized worlds. To further advance our understanding of these planets' compositions, energy budgets, and dynamics, we are carrying out an intensive photometric monitoring campaign of their transits with the Spitzer Space Telescope . In this context, we present 60 new transits of the TRAPPIST-1 planets observed with Spitzer /Infrared Array Camera (IRAC) in 2017 February and March. We combine these observations with previously published Spitzer transit photometry and perform a global analysis of the resulting extensive data set. This analysis refines the transit parameters and provides revised values for the planets' physical parameters, notably their radii, using updated properties for the star. As part of our study, we also measure precise transit timings that will be used in a companion paper to refine the planets' masses and compositions using the transit timing variations method. TRAPPIST-1 shows a very low level of low-frequency variability in the IRAC 4.5-μm band, with a photometric RMS of only 0.11 per cent at a 123-s cadence. We do not detect any evidence of a (quasi-)periodic signal related to stellar rotation. We also analyse the transit light curves individually, to search for possible variations in the transit parameters of each planet due to stellar variability, and find that the Spitzer transits of the planets are mostly immune to the effects of stellar variations. These results are encouraging for forthcoming transmission spectroscopy observations of the TRAPPIST-1 planets with the James Webb Space Telescope . … (more)
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 475:Issue 3(2018)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 475:Issue 3(2018)
- Issue Display:
- Volume 475, Issue 3 (2018)
- Year:
- 2018
- Volume:
- 475
- Issue:
- 3
- Issue Sort Value:
- 2018-0475-0003-0000
- Page Start:
- 3577
- Page End:
- 3597
- Publication Date:
- 2018-01-09
- Subjects:
- techniques: photometric -- stars: individual: TRAPPIST-1 -- planetary systems
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/sty051 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
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