2019
DOI: 10.1051/0004-6361/201935312
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First light of engineered diffusers at the Nordic Optical Telescope reveal time variability of the optical eclipse depth of WASP-12b

Abstract: We present the characterization of two engineered diffusers mounted on the 2.5 meter Nordic Optical Telescope, located at Roque de Los Muchachos, Spain. To assess the reliability and the efficiency of the diffusers, we carried out several test observations of two photometric standard stars, along with observations of one primary transit observation of TrES-3b in the red (R-band), one of CoRoT-1b in the blue (B-band), and three secondary eclipses of WASP-12b in V-band. The achieved photometric precision is in a… Show more

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Cited by 26 publications
(18 citation statements)
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“…Its large semi-major axis (1.37 AU) makes it less susceptible to having its rings warped, and for the bright parent star (J = 7.98), 100 ppm photometry is conceivable with current ground-and space-based facilities. The long transit duration and orbital period of HIP 41378f, however, makes it a difficult target to schedule for the required phase coverage (global networks of high-precision photometers may alleviate this issue; see von Essen et al 2018).…”
Section: Conclusion and Discussionmentioning
confidence: 99%
“…Its large semi-major axis (1.37 AU) makes it less susceptible to having its rings warped, and for the bright parent star (J = 7.98), 100 ppm photometry is conceivable with current ground-and space-based facilities. The long transit duration and orbital period of HIP 41378f, however, makes it a difficult target to schedule for the required phase coverage (global networks of high-precision photometers may alleviate this issue; see von Essen et al 2018).…”
Section: Conclusion and Discussionmentioning
confidence: 99%
“…The contribution of the WASP-33 companion and the orbital eccentricity were considered in the same way as specified before. As described in von Essen et al (2019b), the secondary eclipse model, SE(t), is given by…”
Section: Secondary Eclipse Modelmentioning
confidence: 99%
“…This makes it one of the most heavily irradiated exoplanets known, with an expected day-side temperature of ∼3,000K. Its extreme temperatures have allowed for its secondary eclipse to be observed throughout the infrared (Croll et al 2011;Campo et al 2011;Zhao et al 2012;Crossfield et al 2012;Cowan et al 2012;Stevenson et al 2014;Bell et al 2019) as well as the optical (López-Morales et al 2010;Föhring et al 2013;Hooton et al 2019;von Essen et al 2019). Additionally, the geometric albedo for WASP-12b has been measured to be very low ( g < 0.064) at optical and near-ultraviolet wavelengths (Bell et al 2017) suggesting the planet to be one of the darkest known to date.…”
Section: Introductionmentioning
confidence: 99%