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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…
The Significance of Thermally Pulsing Asymptotic Giant Branch Stars in Post-starburst Galaxies
Luo, A. -Li; Liu, Siqi
We measure the significance of thermally pulsing asymptotic giant branch (TP-AGB) stars via the spectral energy distributions (SEDs) of a sample of post-starburst (PSB) galaxies at z = 0.2-0.7. Using ground- and space-based photometry from the 3D-HST catalog, as well as associated near-infrared (NIR) Hubble Space Telescope (HST) slitless grism spe…