Development of the SPECULOOS exoplanet search project

Sebastian, Daniel; Pedersen, P. P.; Murray, C. A.; Ducrot, Elsa; Garcia, Lionel; Burdanov, Artem; Pozuelos, F. J.; Delrez, Laetitia; Wells, Robert D.; Dransfield, Georgina; Gillon, M.; Demory, Brice-Olivier; Queloz, D.; Triaud, A. H. M. J.; Witt, J. De; Jehin, Emmanuël; Chew, Y. Gómez Maqueo; Günther, Maximilian N.; Niraula, Prajwal; Rackham, Benjamin V.; Schanche, N.; Sohy, Sandrine; Thompson, S.

doi:10.1117/12.2563563

Cited by 4 publications

(1 citation statement)

References 82 publications

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“…All the transits were observed in the Bessel-R passband and the main specifications of both the CCDs are listed in Table 3. The use of ANDOR iKon-L 936 CCD in precision differential photometric observations is well established as the same kind of CCD detectors are used in various transit surveys like the SuperWASP (Pollacco et al 2006) and the SPECULOOS (Sebastian et al 2020). We calibrated the science frames and extracted the lightcurves using the AstroImageJ software (AIJ: Collins et al (2017)).…”

Section: Ground-based Photometrymentioning

confidence: 99%

Discovery of an inflated hot Jupiter around a slightly evolved star TOI-1789

Khandelwal,

Chaturvedi,

Chakraborty

et al. 2021

Preprint

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We report here the discovery of a hot Jupiter at an orbital period of 3.208666 ± 0.000016 days around TOI-1789 (TYC 1962-00303-1, T ES S mag = 9.1) based on the TESS photometry, ground-based photometry, and high-precision radial velocity observations. The high-precision radial velocity observations were obtained from the high-resolution spectrographs, PARAS at Physical Research Laboratory (PRL), India, and TCES at Thüringer Landessternwarte Tautenburg (TLS), Germany, and the ground-based transit observations were obtained using the 0.43 m telescope at PRL with the Bessel-R filter. The host star is a slightly evolved (log g * = 3.939 +0.024 −0.046 ), late F-type (T eff = 5984 +55 −57 K), metal-rich star ([Fe/H]= 0.370 +0.073 −0.089 dex) with a radius of R * = 2.172 +0.037 −0.035 R located at a distance of 223.56 +0.91 −0.90 pc. The simultaneous fitting of the multiple light curves and the radial velocity data of TOI-1789 reveals that TOI-1789b has a mass of M P = 0.70 ± 0.16 M J , a radius of R P = 1.40 +0.22 −0.13 R J , and a bulk density of ρ P = 0.31 +0.15 −0.13 g cm −3 with an orbital separation of a = 0.04873 +0.00065 −0.0016 AU. This puts TOI-1789b in the category of inflated hot Jupiters. It is one of the few nearby evolved stars with a close-in planet. The detection of such systems will contribute to our understanding of mechanisms responsible for inflation in hot Jupiters and also provide an opportunity to understand the evolution of planets around stars leaving the main sequence branch.

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Section: Ground-based Photometrymentioning

confidence: 99%

Discovery of an inflated hot Jupiter around a slightly evolved star TOI-1789

Khandelwal,

Chaturvedi,

Chakraborty

et al. 2021

Preprint

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VaTEST III: Validation of eight potential super-earths from TESS data

Mistry,

Prasad,

Maity

et al. 2024

Publ. Astron. Soc. Aust.

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NASA’s all-sky survey mission, the Transiting Exoplanet Survey Satellite (TESS), is specifically engineered to detect exoplanets that transit bright stars. Thus far, TESS has successfully identified approximately 400 transiting exoplanets, in addition to roughly 6000 candidate exoplanets pending confirmation. In this study, we present the results of our ongoing project, the Validation of Transiting Exoplanets using Statistical Tools (VaTEST). Our dedicated effort is focused on the confirmation and characterization of new exoplanets through the application of statistical validation tools. Through a combination of ground-based telescope data, high-resolution imaging, and the utilization of the statistical validation tool known as TRICERATOPS, we have successfully discovered eight potential super-Earths. These planets bear the designations: TOI-238b ( R⊕), TOI-771b ( R⊕), TOI-871b ( R⊕), TOI-1467b ( R⊕), TOI-1739b ( R⊕), TOI-2068b ( R⊕), TOI-4559b ( R⊕), and TOI-5799b ( R⊕). Among all these planets, six of them fall within the region known as ’keystone planets,’ which makes them particularly interesting for study. Based on the location of TOI-771b and TOI-4559b below the radius valley we characterized them as likely super-Earths, though radial velocity mass measurements for these planets will provide more details about their characterization. It is noteworthy that planets within the size range investigated herein are absent from our own solar system, making their study crucial for gaining insights into the evolutionary stages between Earth and Neptune.

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SPECULOOS Northern Observatory: Searching for Red Worlds in the Northern Skies

Burdanov¹,

Wit²,

Gillon³

et al. 2022

PASP

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SPECULOOS is a ground-based transit survey consisting of six identical 1 m robotic telescopes. The immediate goal of the project is to detect temperate terrestrial planets transiting nearby ultracool dwarfs (late M-dwarf stars and brown dwarfs), which could be amenable for atmospheric research with the next generation of telescopes. Here, we report the developments of the northern counterpart of the project—SPECULOOS Northern Observatory, and present its performance during the first three years of operations from mid-2019 to mid-2022. Currently, the observatory consists of one telescope, which is named Artemis. The Artemis telescope demonstrates remarkable photometric precision, allowing it to be ready to detect new transiting terrestrial exoplanets around ultracool dwarfs. Over the period of the first three years after the installation, we observed 96 objects from the SPECULOOS target list for 6000 hr with a typical photometric precision of 0.5%, and reaching a precision of 0.2% for relatively bright non-variable targets with a typical exposure time of 25 s. Our weather downtime (clouds, high wind speed, high humidity, precipitation and/or high concentration of dust particles in the air) over the period of three years was 30% of overall night time. Our actual downtime is 40% because of additional time loss associated with technical problems.

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Development of the SPECULOOS exoplanet search project

Cited by 4 publications

References 82 publications

Discovery of an inflated hot Jupiter around a slightly evolved star TOI-1789

Discovery of an inflated hot Jupiter around a slightly evolved star TOI-1789

VaTEST III: Validation of eight potential super-earths from TESS data

SPECULOOS Northern Observatory: Searching for Red Worlds in the Northern Skies

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