CHEOPS: a space telescope for ultra-high precision photometry of exoplanet transits

Fortier, A.; Beck, T.; Benz, W.; Broeg, C.; Cessa, Virginie; Ehrenreich, D.; Thomas, Nicolas

doi:10.1117/12.2056687

Cited by 42 publications

(26 citation statements)

References 15 publications

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“…The actual number of planets with precise density measurements is indeed far too low to cover the parameter space and constrain interior, formation, or evolution models for the low-mass planet population. The future transit search missions around bright stars TESS (Ricker et al 2014) and CHEOPS (Broeg et al 2013;Fortier et al 2014) will address this issue from two complementary perspectives. While TESS will substantially increase the number of transiting exoplanets suitable for high-precision RV measurement, CHEOPS will mesure precise radii of known exoplanets that have been discovered with radial velocities to derive precise densities.…”

Section: Discussionmentioning

confidence: 99%

“…Detection and characterization of new low-mass exoplanets orbiting bright stars is motivated by the need to obtain accurate measurements of the projected mass and the eccentricity and to identify all the components of multiple systems to constrain models of exoplanet evolution. Such exoplanets orbiting bright stars will also be key targets for a deeper and more extended characterization with CHEOPS (Broeg et al 2013;Fortier et al 2014), for instance, which searches for the transit, and JWST (Beichman et al 2014), which searches for atmospheric signatures.…”

Section: Introductionmentioning

confidence: 99%

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The SOPHIE search for northern extrasolar planets

Courcol

Bouchy

Pepe

et al. 2015

A&A

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High-precision radial velocity surveys explore the population of low-mass exoplanets orbiting bright stars. This allows accurately deriving their orbital parameters such as their occurrence rate and the statistical distribution of their properties. Based on this, models of planetary formation and evolution can be constrained. The SOPHIE spectrograph has been continuously improved in past years, and thanks to an appropriate correction of systematic instrumental drift, it is now reaching 2 m s −1 precision in radial velocity measurements on all timescales. As part of a dedicated radial velocity survey devoted to search for low-mass planets around a sample of 190 bright solar-type stars in the northern hemisphere, we report the detection of a warm Neptune with a minimum mass of 16.1 ± 2.7 M ⊕ orbiting the solar analog HD 164595 in 40 ± 0.24 days. We also revised the parameters of the multiplanetary system around HD 190360. We discuss this new detection in the context of the upcoming space mission CHEOPS, which is devoted to a transit search of bright stars harboring known exoplanets.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The SOPHIE search for northern extrasolar planets

Courcol

Bouchy

Pepe

et al. 2015

A&A

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“…Attention must be paid as well to other forthcoming missions such as CHEOPS (Fortier et al 2014) or PLATO (Rauer et al 2014), as they are expected to have an impact on ultra-high precision photometry and stellar astroseismology for brigth targets, covering large fractions of the sky (up to 50 per cent in the case of PLATO), and widening, then, the possible detection of new pulsating hot sds. system that can be accessed from a Web page 17 or through a Virtual Observatory ConeSearch…”

Section: Discussionmentioning

confidence: 99%

A search for new hot subdwarf stars by means of virtual observatory tools II

Pérez-Fernández

Solano

Oreiro

et al. 2016

Mon. Not. R. Astron. Soc.

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Recent massive sky surveys in different bandwidths are providing new opportunities to modern astronomy. The Virtual Observatory (VO) represents the adequate framework to handle the huge amount of information available and filter out data according to specific requirements.In this work, we applied a selection strategy to find new, uncatalogued hot subdwarfs making use of VO tools. We used large area catalogues (GALEX, SDSS, SuperCosmos, 2MASS) to retrieve photometric and astrometric information of stellar objects. To these objects, we applied colour and proper motion filters, together with an effective temperature cutoff, aimed at separating hot subdwarfs from other blue objects such as white dwarfs, cataclysmic variables or main sequence OB stars. As a result, we obtained 437 new, uncatalogued hot subdwarf candidates. Based on previous results, we expect our procedure to have an overall efficiency of at least 80 per cent. Visual inspection of the 68 candidates with SDSS spectrum showed that 65 can be classified as hot subdwarfs: 5 sdOs, 25 sdOBs and 35 sdBs. This success rate above 95 per cent proves the robustness and efficiency of our methodology.The spectral energy distribution of 45 per cent of the subdwarf candidates showed infrared excesses, a signature of their probable binary nature. The stellar companions of the binary systems so detected are expected to be late-type main sequence stars. A detailed determination of temperatures and spectral classification of the cool companions will be presented in a forthcoming work.

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“…For the most favourable case, this signal could be detected from the ground (Delrez et al 2016). It would otherwise be an easy case for space-based photometry with a dedicated observatory such as CHEOPS (Fortier et al 2014) or TESS (Ricker et al 2010). Assuming a linear ephemeris for the inner planet, we find that the transit epochs can be computed using the following equation:…”

Section: A System Full Of Potentialmentioning

confidence: 99%

An extreme planetary system around HD 219828

Santos

Santerne

Faria

et al. 2016

A&A

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Context. With about 2000 extrasolar planets confirmed, the results show that planetary systems have a whole range of unexpected properties. This wide diversity provides fundamental clues to the processes of planet formation and evolution. Aims. We present a full investigation of the HD 219828 system, a bright metal-rich star for which a hot Neptune has previously been detected. Methods. We used a set of HARPS, SOPHIE, and ELODIE radial velocities to search for the existence of orbiting companions to HD 219828. The spectra were used to characterise the star and its chemical abundances, as well as to check for spurious, activity induced signals. A dynamical analysis is also performed to study the stability of the system and to constrain the orbital parameters and planet masses. Results. We announce the discovery of a long period (P = 13.1 yr) massive (m sin i = 15.1 M Jup ) companion (HD 219828 c) in a very eccentric orbit (e = 0.81). The same data confirms the existence of a hot Neptune, HD 219828 b, with a minimum mass of 21 M ⊕ and a period of 3.83 days. The dynamical analysis shows that the system is stable, and that the equilibrium eccentricity of planet b is close to zero. Conclusions. The HD 219828 system is extreme and unique in several aspects. First, ammong all known exoplanet systems it presents an unusually high mass ratio. We also show that systems like HD 219828, with a hot Neptune and a long-period massive companion are more frequent than similar systems with a hot Jupiter instead. This suggests that the formation of hot Neptunes follows a different path than the formation of their hot jovian counterparts. The high mass, long period, and eccentricity of HD 219828 c also make it a good target for Gaia astrometry as well as a potential target for atmospheric characterisation, using direct imaging or high-resolution spectroscopy. Astrometric observations will allow us to derive its real mass and orbital configuration. If a transit of HD 219828 b is detected, we will be able to fully characterise the system, including the relative orbital inclinations. With a clearly known mass, HD 219828 c may become a benchmark object for the range in between giant planets and brown dwarfs.

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CHEOPS: a space telescope for ultra-high precision photometry of exoplanet transits

Cited by 42 publications

References 15 publications

The SOPHIE search for northern extrasolar planets

The SOPHIE search for northern extrasolar planets

A search for new hot subdwarf stars by means of virtual observatory tools II

An extreme planetary system around HD 219828

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