VizieR Online Data Catalog: Ground-based spectroscopy of the exoplanet XO-2b (Pearson+, 2019)

Spectroscopic measurements of XO-2b were recorded with GMOS-N on 2016 January 5 at the Gemini 8.1 m Observatory on Maunakea in Hawaii (Allington-Smith et al. 2002PASP..114..892A). The spectrograph is equipped with an e2v deep-depletion (DD) array of three CCDs that make a 6144x4608 pixel sensor with a plate scale of 0.0727"/pixel. The three CCDs are stitched together to create a large detector with an ~20 pixel gap between each CCD. To reduce the read-out time to 12 s, we implemented 2x2 binning and read out a subarray centered only on XO-2N and XO-2S. Observations were conducted with the B600 grating (R~1600) centered on a wavelength of 490 nm. Clocks were synchronized with a GPS every few seconds to ensure accurate timing. Seeing during the observations ranged from 0.64" to 1.07". The cadence of our observations was 102.5 s. Observations began 1 hr prior to the transit ingress and ended 1 hr after egress in order to characterize the out-of-transit baseline. We obtained one transit observation of XO-2b with the 4 m Mayall Telescope on Kitt Peak in Arizona equipped with the multiobject visible-band spectrograph KOSMOS on 2015 February 7. The spectrograph is equipped with a 2 kx4 k e2v DD CCD with a binned plate scale of 0.292"/pixel (Martini et al. 2014SPIE.9147E..0ZM). To reduce the read-out time to 19 s, the CCD was binned 2x2. We used the blue VPH grism, which has a wavelength range of 370-620 nm and R=2100 with peak transmission of ~0.4 near 500 nm. Clocks were synchronized with a GPS every few seconds to ensure accurate timing. Throughout the night, the maximum shift in the centroid along the spatial axis on the detector of our target was less than 1 pixel due to adequate autoguiding. Seeing in the observations ranged from 0.81" to 1.34" throughout the observations.

(3 data files).