Search Publications
Isochrone Fitting of Galactic Globular Clusters—VI. High-latitude Clusters NGC 5024 (M53), NGC 5053, NGC 5272 (M3), NGC 5466, and NGC 7099 (M30)
Savchenko, S. S.; Gontcharov, G. A.; Il'in, V. B. +7 more
We fit various color–magnitude diagrams (CMDs) of the high-latitude Galactic globular clusters NGC 5024 (M53), NGC 5053, NGC 5272 (M3), NGC 5466, and NGC 7099 (M30) by isochrones from the Dartmouth Stellar Evolution Database and Bag of Stellar Tracks and Isochrones for α–enrichment [α/Fe] = +0.4. For the CMDs, we use data sets from Hubble Space Te…
Hubble WFC3 Spectroscopy of the Terrestrial Planets L 98-59 c and d: No Evidence for a Clear Hydrogen Dominated Primary Atmosphere
Zhu, Yi-Nan; Zhou, Li; Ma, Bo +1 more
The nearby bright M-dwarf star L 98-59 has three terrestrial-sized planets. One challenge remaining in characterizing atmospheres around such planets is that it is not known a priori whether they possess any atmospheres. Here we report on study of the atmospheres of L 98-59 c and L 98-59 d using near-infrared spectral data from the G141 grism of H…
Detection of TiO and VO in the Atmosphere of WASP-121b and Evidence For its Temporal Variation
Zhao, Gang; Wang, Wei; Zhao, Fei +6 more
We report the transit observations of the ultra-hot Jupiter WASP-121b using the Goodman High Throughput Spectrograph at the 4 m ground-based Southern Astrophysical Research Telescope, covering the wavelength range 502-900 nm. By dividing the target and reference star into 19 spectroscopic passbands and applying differential spectrophotometry, we d…
A Morphological Study of Two Young Multipolar Planetary Nebulae
Hsia, Chih-Hao; Kang, Xiao-Xi; Wen, Shi-Bo +2 more
We carry out an optical morphological and infrared spectral study for two young planetary nebulae (PNs) Hen 2-158 and Pe 1-1 to understand their complex shapes and dust properties. Hubble Space Telescope optical images reveal that these nebulae have several bipolar-lobed structures and a faint arc with a clear boundary is located at the northweste…
Spatially Resolved Properties of the GW170817 Host Galaxy
Li, Yubin; Mao, Jirong; Zhao, Yinghe +4 more
GW170817 is the unique gravitational-wave (GW) event associated with the electromagnetic (EM) counterpart GRB 170 817A. NGC 4993 is identified as the host galaxy of GW170817/GRB 170 817A. In this paper, we focus on the spatially resolved properties of NGC 4993. We present the photometric results from the comprehensive data analysis of the high spa…
A Two-limb Explanation for the Optical-to-infrared Transmission Spectrum of the Hot Jupiter HAT-P-32Ab
Chen, Guo; Wang, Hong-Chi; Zhao, Hai-Bin +1 more
We present a new optical transmission spectrum of the hot Jupiter HAT-P-32Ab acquired with the Carnegie Observatories Spectrograph and Multiobject Imaging Camera (COSMIC) on the Palomar 200 inch Hale Telescope (P200). The P200/COSMIC transmission spectrum, covering a wavelength range of 3990-9390 Å, is composed of 25 spectrophotometric bins with w…
The Study of Helium Variations in Star Clusters Using China Space Station Telescope
Deng, Licai; Li, Chengyuan; Ji, Xin +2 more
The China Space Station Telescope (CSST) is a 2 m space-based optical-UV telescope. Its primary goal is to carry out a high-resolution photometric imaging survey of a 17,500 square degree sky area using the on board Survey Camera. With its wide field of view (1.1 square degrees) and a mosaic imager containing 640 million pixels, studying the diffe…
The H I Gas Fraction Scaling Relation of the Green Pea Galaxies
Luo, A. -Li; Kong, Xiao; Zhao, Yong-Heng +3 more
Green Pea galaxies are compact galaxies with high star formation rates. However, limited samples of Green Pea galaxies have H I 21 cm measurements. Whether the H I gas fraction (f H I ≡ M H I/M ⋆) of Green Pea galaxies follows the existing scaling relations between the f H I and NUV-r color or linear com…
The Bar-Bulge Relation in Non-dwarf SB0 Galaxies in the Central Region of Coma Cluster
Hasan, S. N.; Poloji, Nagamani; Hasan, Priya
In this paper we explore the formation of bars and present the bulge and bar properties and their correlations for a sample of lenticular barred (SB0) and lenticular unbarred (S0) galaxies in the central region of the Coma Cluster using HST/ACS data. In our sample, we identified bar features using the luminosity profile decomposition software GALF…
Study of Central Intensity Ratio of Seyfert Galaxies in Nearby Universe
Ravikumar, C. D.; Aswathy, S.; Vinod, K. T. +1 more
We use the recently discovered simple photometric parameter Central Intensity Ratio (CIR) determined for a sample of 57 nearby (z < 0.02) Seyfert galaxies to explore the central features of galaxies and their possible connection with galaxy evolution. The sample of galaxies shows strong anti-correlation between CIR and mass of their central sup…