北京大学科维理天文与天体物理研究所

Featured Science

New Discoveries Double the Number of Changing-look AGNs

A team led by Prof. Xue-Bing Wu, the Associate Director of KIAA, has conducted a survey of changing-look quasars in the last two years. They have discovered 21 changing-look quasars at redshift from 0.08 to 0.58, including 5 from repeat spectra in SDSS archive, 10 from repeat spectra in SDSS and LAMOST, and 6 from new spectroscopic observations of photometric variability selected candidates with the 2.16m Xinglong telescope at NAOC.

First observational indication of the gravitomagnetic monopole and naked singularity

The first significant observational indication of the gravitomagnetic monopole has recently been reported by Dr. Chandrachur Chakraborty from Kavli Institute for Astronomy and Astrophysics, Beijing, China and Prof. Sudip Bhattacharyya from Tata Institute of Fundamental Research, Mumbai, India, based on the X-ray observations of an astrophysical collapsed object : GRO J1655-40. They have inferred that this object not only contains the non-zero gravitomagnetic monopole but their result tentatively suggests that the above mentioned astrophysical collapsed object could also be a naked singularity.

Introducing "Hoptunes", a New Class of Exoplanets that Could Help Solve the Mystery of Worlds in Scorching Orbits

A new study offers fresh insight into the planets' perplexing provenance, thanks to a newly described clutch of toasty worlds—dubbed Hoptunes—that are like hot Jupiters' smaller cousins. Led by Subo Dong of the Kavli Institute for Astronomy and Astrophysics (KIAA) at Peking University and Ji-Wei Xie of Nanjing University, the study finds striking similarities between the two planetary types.

18-month twinkle in a forming star suggests the existence of a very young planet

An international team of researchers have found an infrequent variation in the brightness of a forming star. This 18-month recurring twinkle is not only an unexpected phenomenon for scientists, but its repeated behavior suggests the presence of a hidden planet.

ALMA Finds Hints of Early Black-Hole Growth

Ran Wang’s group works on the ISM property of far-infrared (FIR) luminous quasars above redshift 5.7. Their recent paper studying the gas dynamics of a luminous z = 6.13 quasar ULAS J1319+0950 revealed by ALMA high resolution observations (a graduate student Yali Shao as the leading author) was highlighted by the American Astronomical Society (aasnova.org) on 6 September 2017. 

Black Holes with Ravenous Appetites Define Type I Active Galaxies

An international collaboration of astronomers from PUC Chile, CASSACA and KIAA Beijing set out to complete a full census of nearby growing black holes, by using observations carried out in the X-ray band. Similarly to what is typically used for radiographies in hospitals, such observations can see through regions in space that are blocking visible light, such as the dusty regions around black holes. With each observation, performing these “space radiographies”, they could measure the amount of material around the black hole, and then study its evolution.