Almost all chemical elements have been made by nucleosynthetic reactions in various kind of stars and have been accumulated along our cosmic history. Among...
Discovery of Resolved X-ray/radio/optical Supernova Remnants in M31
Chandra observations of M31 allow the first spatially resolved X-ray image of a supernova remnant (SNR) in an external spiral galaxy. CXOM31 J004327.7+411829 is...
Discovery of the first white dwarf + T dwarf binary system and the use of white dwarfs as age calibrators
We present the discovery of the first white dwarf + T dwarf binary system. Systems containing a white dwarf and a brown dwarf are rare but can be used to place...
Discovery of the local counterpart of disc galaxies at z > 4: The oldest thin disc of Milky Way using Gaia-RVS
Context: JWST has recently detected numerous disc galaxies at high-redshifts and there have been observations of cold disc galaxies at z > 4 with ALMA. In the...
Discovery of the optical counterpart to XTEJ1748-361=A1744-36
We report the discovery of the optical counterpart to the X-ray transient XTE J1748-361 using the 6.5m Magellan-Clay telescope at Las Campanas Observatory...
Discovery of the shortest recurrence time between thermonuclear X- ray bursts
An RXTE observation of 4U 1636-536 taken on March 10th, 2009, revealed two type I X-ray bursts from this well studied neutron star low-mass X- ray binary (NS...
We report the discovery of two novae in M81 on a co-added 1600-s narrow-band H-alpha CCD image taken with the 2.5-m Isaac Newton Telescope (INT) + WFC at La...