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Transit timing variation analysis of the low-mass brown dwarf KELT-1 b

Baştürk, Ö; Taylor, J; Yalçınkaya, S; Mancini, L; Esmer, EM; Tekin, M; Tezcan, F; Evans, DF; Tezcan, CT; Bruni, I; Yeşilyaprak, C

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Ö Baştürk

S Yalçınkaya

L Mancini

EM Esmer

M Tekin

F Tezcan

DF Evans

CT Tezcan

I Bruni

C Yeşilyaprak


We investigate whether there is a variation in the orbital period of the short-period brown dwarf-mass KELT-1 b, which is one of the best candidates to observe orbital decay. We obtain 19 high-precision transit light curves of the target using six different telescopes. We add all precise and complete transit light curves from open databases and the literature, as well as the available TESS observations from sectors 17 and 57, to form a transit timing variation (TTV) diagram spanning more than 10 years of observations. The analysis of the TTV diagram, however, is inconclusive in terms of a secular or periodic variation, hinting that the system might have synchronized. We update the transit ephemeris and determine an informative lower limit for the reduced tidal quality parameter of its host star of Q'?>(8.5±3.9)×106 assuming that the stellar rotation is not yet synchronised. Using our new photometric observations, published light curves, the TESS data, archival radial velocities and broadband magnitudes, we also update the measured parameters of the system. Our results are in good agreement with those found in previous analyses.


Baştürk, Ö., Taylor, J., Yalçınkaya, S., Mancini, L., Esmer, E., Tekin, M., …Yeşilyaprak, C. (2023). Transit timing variation analysis of the low-mass brown dwarf KELT-1 b. Monthly Notices of the Royal Astronomical Society, 521(1), 1200-1209.

Journal Article Type Article
Acceptance Date Jan 16, 2023
Online Publication Date Jan 25, 2023
Publication Date 2023-05
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 521
Issue 1
Pages 1200-1209
Keywords methods:data analysis; techniques:photometric; stars:fundamental parameteres; stars:individual:KELT-1-planetary systems
Publisher URL


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