News
A Be-type star with a black hole companion.
Stellar-mass black holes have all been discovered through X-ray emission, which arises from the accretion of gas from their binary companions (this gas is...
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NewsA Black Hole Nova Obscured by an Inner Disk Torus.Stellar-mass black holes (BHs) are mostly found in X-ray transients, a subclass of X-ray binaries that exhibit violent outbursts. None of the ~50 galactic BHs...
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NewsA candidate massive black hole in the low-metallicity dwarf galaxy pair Mrk 709.The incidence and properties of present-day dwarf galaxies hosting massive black holes (BHs) can provide important constraints on the origin of high-redshift BH...
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NewsA chromospheric resonance cavity in a sunspot mapped with seismologySunspots are intense collections of magnetic fields that pierce through the Sun’s photosphere, with their signatures extending upwards into the outermost...
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NewsA cold wind during the discovery outburst of a black holeWe present 12 epochs of optical spectroscopy taken across the discovery outburst of the black hole (BH) candidate MAXI J1803-298 with the Gran Telescopio...
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NewsA crucial test for astronomical spectrograph calibration with frequency combsLaser frequency combs (LFCs) are well on their way to becoming the next-generation calibration sources for precision astronomical spectroscopy. This development...
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NewsA dense ultra-short period sub-Earth planet transiting a nearby red dwarf starUltrashort-period (USP) exoplanets have orbital periods shorter than 1 day. Precise masses and radii of USP exoplanets could provide constraints on their...
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NewsA distance of 13 Mpc resolves the claimed anomalies of the galaxy lacking dark matterThe claimed detection of a diffuse galaxy lacking dark matter represents a possible challenge to our understanding of the properties of these galaxies and...
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NewsA dwarf irregular galaxy caught in transitionLeo I is one of the youngest dwarf spheroidal (dSph) galaxies in the Local Group. Its relative isolation, extended and complex star formation history (SFH), and...