학술논문
INTENSIVE MONITORING SURVEY OF NEARBY GALAXIES (IMSNG)
Document Type
Article
Author
Myungshin Im; Changsu Choi; Sungyong Hwang; Gu Lim; Joonho Kim; Sophia Kim; Gregory S. H. Paek; Sang-Yun Lee; Sung-Chul Yoon; Hyunjin Jung; 성현일; Yeong-beom Jeon; Shuhrat Ehgamberdiev; Otabek Burhonov; Davron Milzaqulov; Omon Parmonov; Sang Gak Lee; Wonseok Kang; Taewoo Kim; Sun-gill Kwon; Soojong Pak; Tae-Geun Ji; Hye-In Lee; 박우진; Hojae Ahn; Seoyeon Byeon; Jimin Han; Coyne Gibson; J. Craig Wheeler; John Kuehne; Chris Johns-Krull; Jennifer Marshall; Minhee Hyun; Seong-Kook J. Lee; Yongjung Kim; Yongmin Yoon; Insu Paek; 신수현; Yoon Chan Taak; Juhyung Kang; Seoyeon Choi; Mankeun Jeong; 정무건; Hwara Kim; Jisu Kim; Dayae Lee; Bomi Park; Keunwoo Park; Seong A O
Source
Journal of the Korean Astronomical Society, 52(1), pp.11-21 Feb, 2019
Subject
Language
English
ISSN
2288-890X
1225-4614
1225-4614
Abstract
Intensive Monitoring Survey of Nearby Galaxies (IMSNG) is a high cadence observation program monitoring nearby galaxies with high probabilities of hosting supernovae (SNe). IMSNG aims to constrain the SN explosion mechanism by inferring sizes of SN progenitor systems through the detection of the shock-heated emission that lasts less than a few days after the SN explosion. To catch the signal, IMSNG utilizes a network of 0.5-m to 1-m class telescopes around the world and monitors the images of 60 nearby galaxies at distances $D < 50$ Mpc to a cadence as short as a few hours. The target galaxies are bright in near-ultraviolet (NUV) with $M_{NUV} < -18.4$ AB mag and have high probabilities of hosting SNe (0.06 SN yr$^{-1}$ per galaxy). With this strategy, we expect to detect the early light curves of 3.4 SNe per year to a depth of $R \sim 19.5$ mag, enabling us to detect the shock-heated emission from a progenitor star with a radius as small as 0.1 $R_{\odot}$. The accumulated data will be also useful for studying aint features around the target galaxies and other science projects. So far, 18 SNe have occurred in our target fields (16 in IMSNG galaxies) over 5 years, confirming our SN rate estimate of 0.06 SN yr$^{-1}$ per galaxy.