Knicole D. ColónGeorge ZhouAvi ShporerKaren A. CollinsAllyson BierylaNéstor EspinozaFelipe MurgasPetchara PattarakijwanichSupachai AwiphanJames D. ArmstrongJeremy BaileyGeert BarentsenDaniel BaylissAnurak ChakporWilliam D. CochranVikram S. DhillonKeith HorneMichael IrelandLucyna Kedziora-ChudczerJohn F. KielkopfSiramas KomonjindaDavid W. LathamTom R. MarshDavid E. MkrtichianEnric PalléDavid RuffoloRamotholo SefakoChris G. TinneySuwicha WannawichianSuraphong YumaBay Area Environmental Research InstitutePontificia Universidad Católica de ChileUniversity of Hawaii SystemUniversity of New South Wales (UNSW) AustraliaMassachusetts Institute of TechnologyUniversity of St AndrewsThe University of WarwickHarvard-Smithsonian Center for AstrophysicsUniversity of LouisvilleUniversity of Texas at AustinMahidol UniversityInstituto Astrofisico de CanariasAustralian National UniversityMax Planck Institut für AstronomieNASA Goddard Space Flight CenterNASA Ames Research CenterUniversidad de la LagunaSouth African Astronomical ObservatoryUniversity of SheffieldChiang Mai UniversityMillennium Institute of AstrophysicsNational Astronomical Research Institute of Thailand2019-08-232019-08-232018-11-01Astronomical Journal. Vol.156, No.5 (2018)000462562-s2.0-85056709669https://repository.li.mahidol.ac.th/handle/20.500.14594/45734© 2018. The American Astronomical Society. All rights reserved. We present 45 ground-based photometric observations of the K2-22 system collected between 2016 December and 2017 May, 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.Mahidol UniversityEarth and Planetary SciencesPhysics and AstronomyArticleSCOPUS10.3847/1538-3881/aae31b