Stellar Astrophysics Centre:

Research on the Sun, stars

and extra-solar planets


25.10.2016 |

New SAC Postdoc - Kuldeep Verma

Kuldeep Verma has joined the Stellar Astrophysics Centre on 1 October 2016

09.06.2016 |

Mia Sloth Lundkvist awarded IDA PhD prize for 2015

The new yearly IDA PhD Prize has been awarded on 14 June during the Annual National Astronomy Meeting at Sandbjerg Estate. Nominations from supervisors of Danish PhD theses defended in 2015 have been recieved by the evaluations committee, and the theses have been evaluated on basis of their scientific exellence. The committee has unanimously…

The size of subgiant K2-39 and its exoplanet. K2-39b are shown relative to the size of the Sun. The distance between K2-39 and its planet is also indicated, relative to the distance of the Sun to Mercury. The Earth is not shown on this figure, because it is more than two times further away than Mercury.

07.06.2016 |

Fantastic coincidence: a planet that shouldn’t be there at all

SAC scientists have discovered a new giant exoplanet orbiting a subgiant star so close that the planet ought to have been destroyed by tidal forces - but it isn't - at least not yet!

The image above shows the M4 globular cluster and the position in the sky of some of the stars in which acoustic oscillations were detected. By hovering the mouse over the targets you will hear the sounds characteristic of their global oscillations. The pitch (frequencies) of the sounds have been raised by a factor 10 million to bring them into the audible range.  On the same frequency scale, the acoustic oscillations of the Sun would be so high that they would fall in the ultrasound regime.  The relative sizes of the stars studied in this work are illustrated on the right-hand panel: these are giant stars with radii from eight to sixteen times that of the Sun (which explains why their modes have such low frequencies compared to those detected in the Sun).

07.06.2016 |

Asteroseismologists listen to the relics of the Milky Way: sounds from the oldest stars in our Galaxy

An international group of astrophysicists from the universities of Birmingham, Aarhus, Paris, Padua, San Diego and from Mt Stromlo Observatory in Australia have captured the sounds of some of the oldest stars in our galaxy, the Milky Way, according to research published 7 June 2016 in the Royal Astronomical Society journal Monthly Notices.

Artist's impression of a hot super-Earth being stripped of it's atmosphere due to being too close to the mother planet. (image credit: Peter Devine)

11.04.2016 |

Don't come too close to the stars if you are a super-Earth

Coming too close to the fire will get your fingers burnt. This is also valid for exoplanets orbiting remote stars. Mia S. Lundkvist et al; many affiliated with SAC, have shown that it is also true in the real world. Recent paper titled "Hot super-Earths stripped by their host stars" in Nature Communications.

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