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Multi-wavelength observations of the EUV variable metal-rich white dwarf GD 394
David J. Wilson, Boris T. Gaensicke, Detlev Koester +13
We present new Hubble Space Telescope (HST) ultraviolet and ground-based optical observations of the hot, metal-rich white dwarf GD 394. Extreme-ultraviolet (EUV) observations in 1…
Detection of a giant flare displaying quasi-periodic pulsations from a pre-main sequence M star with NGTS
James A. G. Jackman, Peter J. Wheatley, Chloe E. Pugh +18
We present the detection of an energetic flare on the pre-main sequence M3 star NGTS J121939.5-355557, which we estimate as only 2 Myr old. The flare had an energy of $3.2\pm^{0.4}…
The direct detection of the irradiated brown dwarf in the white dwarf - brown dwarf binary SDSS J141126.20+200911.1
S. L. Casewell, S. P. Littlefair, S. G. Parsons +3
We have observed the eclipsing, post-common envelope white dwarf-brown dwarf binary, SDSS141126.20+200911.1, in the near-IR with the HAWK-I imager, and present here the first direc…
The gravitational redshift of Sirius B
Simon R. G. Joyce, Martin A. Barstow, Jay B. Holberg +3
Einstein's theory of General Relativity predicts that the light from stars will be gravitationally shifted to longer wavelengths. We previously used this effect to measure the mass…
NGTS-4b: A sub-Neptune Transiting in the Desert
Richard G. West, Edward Gillen, Daniel Bayliss +48
We report the discovery of NGTS-4b, a sub-Neptune-sized planet transiting a 13th magnitude K-dwarf in a 1.34d orbit. NGTS-4b has a mass M=M_E and radius R=…
Revealing the True Nature of Hen 2-428
Nicole Reindl, Nicolle L. Finch, Veronika Schaffenroth +5
The nucleus of Hen 2-428 is a short orbital period (4.2 h) spectroscopic binary, whose status as potential supernovae type Ia progenitor has raised some controversy in the literatu…