We present 45 ground-based photometric observations of the K2-22 system collected between December 2016 and May 2017, which we use to investigate the evolution of the transit of the disintegrating planet K2-22b. Last observed in early 2015, in these new observations we recover the transit at multiple epochs and measure a typical depth of <1.5%. We find that the distribution of our measured transit depths is comparable to the range of depths measured in observations from 2014 and 2015. These new observations also support ongoing variability in the K2-22b transit shape and time, although the overall shallowness of the transit makes a detailed analysis of these transit parameters difficult. We find no strong evidence of wavelength-dependent transit depths for epochs where we have simultaneous coverage at multiple wavelengths, although our stacked Las Cumbres Observatory data collected over days-to-months timescales are suggestive of a deeper transit at blue wavelengths. We encourage continued high-precision photometric and spectroscopic monitoring of this system in order to further constrain the evolution timescale and to aid comparative studies with the other few known disintegrating planets.
@article{arxiv.1809.06978,
title = {A Large Ground-Based Observing Campaign of the Disintegrating Planet K2-22b},
author = {Knicole D. Colón and George Zhou and Avi Shporer and Karen A. Collins and Allyson Bieryla and Néstor Espinoza and Felipe Murgas and Petchara Pattarakijwanich and Supachai Awiphan and James D. Armstrong and Jeremy Bailey and Geert Barentsen and Daniel Bayliss and Anurak Chakpor and William D. Cochran and Vikram S. Dhillon and Keith Horne and Michael Ireland and Lucyna Kedziora-Chudczer and John F. Kielkopf and Siramas Komonjinda and David W. Latham and Tom. R. Marsh and David E. Mkrtichian and Enric Pallé and David Ruffolo and Ramotholo Sefako and Chris G. Tinney and Suwicha Wannawichian and Suraphong Yuma},
journal= {arXiv preprint arXiv:1809.06978},
year = {2018}
}
Comments
Accepted for publication in the Astronomical Journal