J/MNRAS/521/5636 HATS-46 b EFOSC2 light curve (Ahrer+, 2023)
LRG-BEASTS: evidence for clouds in the transmission spectrum of HATS-46 b.
Ahrer E., Wheatley P.J., Gandhi S., Kirk J., King G.W., Louden T.,
Welbanks L.
<Mon. Not. R. Astron. Soc. 521, 5636-5644 (2023)>
=2023MNRAS.521.5636A 2023MNRAS.521.5636A (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Spectra, optical
Keywords: methods: observational - techniques: spectroscopic -
planets and satellites: atmospheres -
planets and satellites: individual: HATS-46b
Abstract:
We have performed low-resolution ground-based spectroscopy of HATS-46
b in transmission, using the EFOSC2 instrument on the ESO New
Technology Telescope (NTT). HATS-46 b is a highly inflated exoplanet
that is a prime target for transmission spectroscopy, having a
Jupiter-like radius (0.95RJup) but a much lower mass (0.16MJup).
It orbits a G-type star with a 4.7d period, giving an equilibrium
temperature of 1100K. We observed one transit of HATS-46 b with the
NTT, with the time-series spectra covering a wavelength range of
3900-9000Å at a resolution (R) of ∼380. We achieved a remarkably
precise transmission spectrum of 1.03 x photon noise, with a median
uncertainty of 357ppm for ∼200Å-wide bins, despite the relative
faintness of the host star with Vmag=13.6. The transmission spectrum
does not show strong absorption features and retrievals favour a
cloudy model, ruling out a clear atmosphere with 3.0σ
confidence. We also place a conservative upper limit on the sodium
abundance under the alternative scenario of a clear atmosphere. This
is the eighth planet in the LRG-BEASTS (Low-Resolution Ground-Based
Exoplanet Atmosphere Survey using Transmission Spectroscopy) survey,
which uses 4 m-class telescopes such as the NTT to obtain
low-resolution transmission spectra of hot Jupiters with precisions of
around one atmospheric scale height.
Description:
These tables contain the wavelength binned and white-light light
curves of the transit of HATS-46b observed with the EFOSC2 instrument
on the New Technology Telescope (NTT) on the night of 17 August 2017.
Objects:
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RA (2000) DE Designation(s)
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00 26 48.59 -56 18 58.08 HATS-46 = TIC 281541555
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lc.dat 663 93 Wavelength binned and white-light light curves
of the transit of HATS-46b
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See also:
J/AJ/155/112 : Radial velocities + light curves for HATS-43 - HATS-46
(Brahm+, 2018)
Byte-by-byte Description of file: lc.dat
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Bytes Format Units Label Explanations
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1- 15 F15.9 d Time Time in MJD
17- 27 F11.9 --- FWL Normalised white-light flux (3900-9000Å)
29- 39 F11.9 --- e_FWL Error in white-light flux (3900-9000Å)
41- 51 F11.9 --- FWB01 Normalised flux in 300Å-wide bin
centred on 4050Å
53- 63 F11.9 --- e_FWB01 Error in flux in 300Å-wide bin
centred on 4050Å
65- 75 F11.9 --- FWB02 Normalised flux in 240Å-wide bin
centred on 4320Å
77- 87 F11.9 --- e_FWB02 Error in flux in 240Å-wide bin
centred on 4320Å
89- 99 F11.9 --- FWB03 Normalised flux in 240Å-wide bin
centred on 4560Å
101-111 F11.9 --- e_FWB03 Error in flux in 240Å-wide bin
centred on 4560Å
113-123 F11.9 --- FWB04 Normalised flux in 230Å-wide bin
centred on 4795Å
125-135 F11.9 --- e_FWB04 Error in flux in 230Å-wide bin
centred on 4795Å
137-147 F11.9 --- FWB05 Normalised flux in 210Å-wide bin
centred on 5015Å
149-159 F11.9 --- e_FWB05 Error in flux in 210Å-wide bin
centred on 5015Å
161-171 F11.9 --- FWB06 Normalised flux in 230Å-wide bin
centred on 5235Å
173-183 F11.9 --- e_FWB06 Error in flux in 230Å-wide bin
centred on 5235Å
185-195 F11.9 --- FWB07 Normalised flux in 220Å-wide bin
centred on 5460Å
197-207 F11.9 --- e_FWB07 Error in flux in 220Å-wide bin
centred on 5460Å
209-219 F11.9 --- FWB08 Normalised flux in 248Å-wide bin
centred on 5694Å
221-231 F11.9 --- e_FWB08 Error in flux in 248Å-wide bin
centred on 5694Å
233-243 F11.9 --- FWB09 Normalised flux in 50Å-wide bin
centred on 5843Å
245-255 F11.9 --- e_FWB09 Error in flux in 50Å-wide bin
centred on 5843Å
257-267 F11.9 --- FWB10 Normalised flux in 50Å-wide bin
centred on 5893Å
269-279 F11.9 --- e_FWB10 Error in flux in 50Å-wide bin
centred on 5893Å
281-291 F11.9 --- FWB11 Normalised flux in 50Å-wide bin
centred on 5943Å
293-303 F11.9 --- e_FWB11 Error in flux in 50Å-wide bin
centred on 5943Å
305-315 F11.9 --- FWB12 Normalised flux in 222Å-wide bin
centred on 6079Å
317-327 F11.9 --- e_FWB12 Error in flux in 222Å-wide bin
centred on 6079Å
329-339 F11.9 --- FWB13 Normalised flux in 210Å-wide bin
centred on 6295Å
341-351 F11.9 --- e_FWB13 Error in flux in 210Å-wide bin
centred on 6295Å
353-363 F11.9 --- FWB14 Normalised flux in 210Å-wide bin
centred on 6505Å
365-375 F11.9 --- e_FWB14 Error in flux in 210Å-wide bin
centred on 6505Å
377-387 F11.9 --- FWB15 Normalised flux in 210Å-wide bin
centred on 6715Å
389-399 F11.9 --- e_FWB15 Error in flux in 210Å-wide bin
centred on 6715Å
401-411 F11.9 --- FWB16 Normalised flux in 220Å-wide bin
centred on 6930Å
413-423 F11.9 --- e_FWB16 Error in flux in 220Å-wide bin
centred on 6930Å
425-435 F11.9 --- FWB17 Normalised flux in 200Å-wide bin
centred on 7140Å
437-447 F11.9 --- e_FWB17 Error in flux in 200Å-wide bin
centred on 7140Å
449-459 F11.9 --- FWB18 Normalised flux in 200Å-wide bin
centred on 7340Å
461-471 F11.9 --- e_FWB18 Error in flux in 200Å-wide bin
centred on 7340Å
473-483 F11.9 --- FWB19 Normalised flux in 209Å-wide bin
centred on 7544Å
485-495 F11.9 --- e_FWB19 Error in flux in 209Å-wide bin
centred on 7544Å
497-507 F11.9 --- FWB20 Normalised flux in 100Å-wide bin
centred on 7699Å
509-519 F11.9 --- e_FWB20 Error in flux in 100Å-wide bin
centred on 7699Å
521-531 F11.9 --- FWB21 Normalised flux in 201Å-wide bin
centred on 7849Å
533-543 F11.9 --- e_FWB21 Error in flux in 201Å-wide bin
centred on 7849Å
545-555 F11.9 --- FWB22 Normalised flux in 200Å-wide bin
centred on 8050Å
557-567 F11.9 --- e_FWB22 Error in flux in 200Å-wide bin
centred on 8050Å
569-579 F11.9 --- FWB23 Normalised flux in 200Å-wide bin
centred on 8250Å
581-591 F11.9 --- e_FWB23 Error in flux in 200Å-wide bin
centred on 8250Å
593-603 F11.9 --- FWB24 Normalised flux in 200Å-wide bin
centred on 8450Å
605-615 F11.9 --- e_FWB24 Error in flux in 200Å-wide bin
centred on 8450Å
617-627 F11.9 --- FWB25 Normalised flux in 220Å-wide bin
centred on 8660Å
629-639 F11.9 --- e_FWB25 Error in flux in 220Å-wide bin
centred on 8660Å
641-651 F11.9 --- FWB26 Normalised flux in 230Å-wide bin
centred on 8885Å
653-663 F11.9 --- e_FWB26 Error in flux in 230Å-wide bin
centred on 8885Å
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Acknowledgements:
Eva-Maria Ahrer, eva-maria.ahrer(at)warwick.ac.uk
(End) Patricia Vannier [CDS] 24-Apr-2023