Shallow transit follow‐up from N<scp>ext‐Generation Transit Survey</scp>: Simultaneous observations of <scp>HD 106315</scp> with 11 identical telescopes

Smith, A. M. S.; Eigmüller, Philipp; Gurumoorthy, Ramanathan; Csizmadia, Szilárd; Bayliss, Daniel; Burleigh, M. R.; Cabrera, J.; Casewell, Sarah L.; Erikson, A.; Goad, M. R.; Grange, Andrew; Jenkins, James S.; Pollacco, D.; Rauer, H.; Raynard, Liam; Udry, S.; West, R. G.; Wheatley, P. J.

doi:10.1002/asna.202013768

Cited by 25 publications

(18 citation statements)

References 28 publications

(49 reference statements)

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“…The DONUTS auto-guiding algorithm (McCormac et al 2013) affords the NGTS telescopes sub-pixel level guiding. Simultaneous observations using multiple NGTS telescopes have been shown to yield ultra high precision light curves of exoplanet transits (Bryant et al 2020;Smith et al 2020).…”

Section: Ngtsmentioning

confidence: 99%

Six transiting planets and a chain of Laplace resonances in TOI-178

Leleu

Alibert²,

Hara³

et al. 2021

A&A

131

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Determining the architecture of multi-planetary systems is one of the cornerstones of understanding planet formation and evolution. Resonant systems are especially important as the fragility of their orbital configuration ensures that no significant scattering or collisional event has taken place since the earliest formation phase when the parent protoplanetary disc was still present. In this context, TOI-178 has been the subject of particular attention since the first TESS observations hinted at the possible presence of a near 2:3:3 resonant chain. Here we report the results of observations from CHEOPS, ESPRESSO, NGTS, and SPECULOOS with the aim of deciphering the peculiar orbital architecture of the system. We show that TOI-178 harbours at least six planets in the super-Earth to mini-Neptune regimes, with radii ranging from 1.152−0.070+0.073 to 2.87−0.13+0.14 Earth radii and periods of 1.91, 3.24, 6.56, 9.96, 15.23, and 20.71 days. All planets but the innermost one form a 2:4:6:9:12 chain of Laplace resonances, and the planetary densities show important variations from planet to planet, jumping from 1.02−0.23+0.28 to 0.177−0.061+0.055 times the Earth’s density between planets c and d. Using Bayesian interior structure retrieval models, we show that the amount of gas in the planets does not vary in a monotonous way, contrary to what one would expect from simple formation and evolution models and unlike other known systems in a chain of Laplace resonances. The brightness of TOI-178 (H = 8.76 mag, J = 9.37 mag, V = 11.95 mag) allows for a precise characterisation of its orbital architecture as well as of the physical nature of the six presently known transiting planets it harbours. The peculiar orbital configuration and the diversity in average density among the planets in the system will enable the study of interior planetary structures and atmospheric evolution, providing important clues on the formation of super-Earths and mini-Neptunes.

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Section: Ngtsmentioning

confidence: 99%

Six transiting planets and a chain of Laplace resonances in TOI-178

Leleu

Alibert²,

Hara³

et al. 2021

A&A

131

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“…The NGTS telescopes also benefit from subpixel guiding afforded by the DONUTS autoguiding algorithm (McCormac et al 2013). By using multiple NGTS telescopes to simultaneously observe the same star, NGTS can achieve ultra-high-precision light curves of exoplanet transits (Bryant et al 2020;Smith et al 2020).…”

Section: Ngtsmentioning

confidence: 99%

The TESS-Keck Survey. II. An Ultra-short-period Rocky Planet and Its Siblings Transiting the Galactic Thick-disk Star TOI-561

Weiss

Dai²,

Huber

et al. 2021

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“…In addition to its survey mode, where each telescope observes a different field to maximise sky coverage, NGTS can also be operated in a mode where multiple telescopes observe the same target simultaneously (Smith et al 2020). This mode is used for followup of shallow transits detected by the NGTS survey, as well as for TESS targets (Jenkins et al 2020;Armstrong et al 2020) and for other exoplanets transiting bright stars (Bryant et al 2020).…”

Section: Ngts Multi-telescope Observationsmentioning

confidence: 99%

NGTS-14Ab: a Neptune-sized transiting planet in the desert

Smith

Acton

Anderson

et al. 2021

A&A

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Context. The sub-Jovian, or Neptunian, desert is a previously identified region of parameter space where there is a relative dearth of intermediate-mass planets with short orbital periods. Aims. We present the discovery of a new transiting planetary system within the Neptunian desert, NGTS-14. Methods. 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. Results. NGTS-14Ab has a radius that is about 30 per cent larger than that of Neptune (0.444 ± 0.030 RJup) 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 away 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, and we investigate the binarity of exoplanet host stars inside and outside the Neptunian desert using Gaia.

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Shallow transit follow‐up from Next‐Generation Transit Survey: Simultaneous observations of HD 106315 with 11 identical telescopes

Cited by 25 publications

References 28 publications

Six transiting planets and a chain of Laplace resonances in TOI-178

Six transiting planets and a chain of Laplace resonances in TOI-178

The TESS-Keck Survey. II. An Ultra-short-period Rocky Planet and Its Siblings Transiting the Galactic Thick-disk Star TOI-561

NGTS-14Ab: a Neptune-sized transiting planet in the desert

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