J/A+A/646/A183 Transit photometry of NGTS-14Ab (Smith+, 2021)
NGTS-14Ab: a Neptune-sized transiting planet in the desert.
Smith A.M.S., Acton J.S., Anderson D.R., Armstrong D.J., Bayliss D.,
Belardi C., Bouchy F., Brahm R., Briegal J.T., Byrant E.M.,
Burleigh M.R., Cabrera J., Chaushev A., Cooke B.F., Costes J.C.,
Csizmadia Sz., Eigmueller P., Erikson A., Gill S., Gillen E., Goad M.R.,
Guenther M.N., Henderson B.A., Hogan A., Jordan A., Lendl M., McCormac J.
Moyano M., Nielsen L.D., Rauer H., Raynard L., Tilbrook R.H., Turner O.
Udry S., Vines J.I., Watson C.A., West R.G., Wheatley P.J.
<Astron. Astrophys. 646, A183 (2021)>
=2021A&A...646A.183S 2021A&A...646A.183S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Photometry
Keywords: planetary systems - planets and satellites: detection -
planets and satellites: individual: NGTS-14Ab - binaries: general
Abstract:
The sub-Jovian or Neptunian desert is a previously-identified region
of parameter space where there is a relative dearth of intermediate-
mass planets at short orbital periods.
We present the discovery of a new transiting planetary system within
the Neptunian desert, NGTS-14A.
Transits of NGTS-14Ab were discovered in photometry from the Next
Generation Transit Survey (NGTS). Follow-up transit photometry was
conducted from several ground-based facilities, as well as extracted
from TESS full- frame images. We combine radial velocities from the
HARPS spectrograph with the photometry in a global analysis to
determine the system parameters.
NGTS-14Ab has a radius about 30 per cent larger than that of Neptune
(0.444±0.030RJup), and is around 70 per cent more massive than
Neptune (0.092±0.012 MJup). It transits the main-sequence K1 star,
NGTS-14A, with a period of 3.54 days, just far enough to have
maintained at least some of its primordial atmosphere. We have also
identified a possible long-period stellar mass companion to the
system, NGTS-14B.
Description:
Transit photometry of NGTS-14Ab from a variety of
telescopes/instruments. The photometry is not corrected for
contamination from NGTS-14B.
Objects:
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RA (2000) DE Designation(s)
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21 54 04.20 -38 22 38.71 NGTS-14A = Gaia DR2 6585082036193768832
21 54 03.89 -38 22 38.55 NGTS-14B = Gaia DR2 6585082036193769088
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 44 3108 Photometry of NGTS-14A
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 F13.8 d BJD Truncated Barycentric Julian Day (UTC) of the
measurement (BJD-2450000)
15- 24 F10.8 --- Flux Measured relative flux of NGTS-14A, normalised
to unity
26- 36 F11.9 --- e_Flux 1-sigma uncertainty on flux
38- 44 A7 --- Inst Telescope/instrument used for measurement (1)
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Note (1): Telescope/instrument as follows:
NGTS = Next Generation Survey Telescope (in survey mode)
NGTSfup = NGTS in multi-telescope follow-up mode
CHAT = Chilean-Hungarian Automated Telescope
SAAO = South African Astronomical Observatory 1-m with Sutherland
High-speed Optical Camera (SHOC'n'awe)
Euler = 1.2-m Swiss Euler Telescope with EulerCam
TESS = Transiting Exoplanet Survey Satellite
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Acknowledgements:
Alexis M.S. Smith, alexis.smith(at)dlr.de
(End) Alexis M.S. Smith [DLR, Germany], Patricia Vannier [CDS] 06-Jan-2021