Abstract Details

Name: Saumya Gupta
Affiliation: IISER Tirupati
Conference ID: ASI2021_407
Title : Circumstellar Disk Evolution in Cygnus OB2: A deep multi-wavelength study of a Galactic proto-globular cluster
Authors and Co-Authors : Saumya Gupta (IISER Tirupati, India), Jessy Jose (IISER Tirupati, India), Swagat R. Das (IISER Tirupati, India), Surhud More (IUCAA, India), Manash Samal (PRL, India), Gregory Herczeg (KIAA/PKU, China), Michihiro Takami (ASIAA), Satoko Takahashi (NAOJ/JAO), Tsuyoshi Terai (NAOJ), Zhen Guo (University of Hertfordshire, UK), Katsuo Ogura (Kokugakuin University, Japan)
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : Circumstellar disk evolution plays a key role in the growth of stars and formation of planetary systems. And yet it is one of the many interesting yet unanswered questions posed to the astrophysical community. Deep, large-scale studies of various star-forming regions are required to understand the effect of cluster environment on disk evolution, their dispersal and hence, on the planet formation. At 1.6 kpc distance from the Sun and with ~150 OB-stars, Cygnus OB2 is an ideal laboratory to study the role of feedback-driven environment on disk evolution in one of the most massive regions outside the solar neighborhood. We have obtained the deepest and the widest optical photometry with 8m Subaru Hyper Suprime-Cam (HSC) of a 1.5 deg diameter region centred at Cygnus OB2. We combine our deep optical photometry with near-IR (UKIDSS) and mid-IR (Spitzer) photometry to study the pre-main sequence population (~ 10^5 sources) reaching down to brown-dwarf limit including a significant census of disk-bearing objects. We identify circumstellar disk population in the target region and analyze the disk evolution as a function of age and mass by dividing the data into constant mass and age bins. We estimate the spatial variation of disk fraction across the region as a function of incident UV flux and thus quantify the role of external photoevaporation on disk evolution. We further aim to identify the sub-stellar population and obtain the IMF in the low-mass regime in one of the most massive regions outside the solar neighborhood.