A planetesimal orbiting within the debris disc around a white dwarf star. (arXiv:1904.02163v1 [astro-ph.EP])

A planetesimal orbiting within the debris disc around a white dwarf star. (arXiv:1904.02163v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Manser_C/0/1/0/all/0/1">Christopher J. Manser</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gansicke_B/0/1/0/all/0/1">Boris T. Gänsicke</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Eggl_S/0/1/0/all/0/1">Siegfried Eggl</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hollands_M/0/1/0/all/0/1">Mark Hollands</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Izquierdo_P/0/1/0/all/0/1">Paula Izquierdo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Koester_D/0/1/0/all/0/1">Detlev Koester</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Landstreet_J/0/1/0/all/0/1">John D. Landstreet</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lyra_W/0/1/0/all/0/1">Wladimir Lyra</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Marsh_T/0/1/0/all/0/1">Thomas R. Marsh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Meru_F/0/1/0/all/0/1">Farzana Meru</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mustill_A/0/1/0/all/0/1">Alexander J. Mustill</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rodriguez_Gil_P/0/1/0/all/0/1">Pablo Rodríguez-Gil</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Toloza_O/0/1/0/all/0/1">Odette Toloza</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Veras_D/0/1/0/all/0/1">Dimitri Veras</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wilson_D/0/1/0/all/0/1">David J. Wilson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Burleigh_M/0/1/0/all/0/1">Matthew R. Burleigh</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Davies_M/0/1/0/all/0/1">Melvyn B. Davies</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Farihi_J/0/1/0/all/0/1">Jay Farihi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Fusillo_N/0/1/0/all/0/1">Nicola Gentile Fusillo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Martino_D/0/1/0/all/0/1">Domitilla de Martino</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Parsons_S/0/1/0/all/0/1">Steven G. Parsons</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Quirrenbach_A/0/1/0/all/0/1">Andreas Quirrenbach</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Raddi_R/0/1/0/all/0/1">Roberto Raddi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Reffert_S/0/1/0/all/0/1">Sabine Reffert</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Santo_M/0/1/0/all/0/1">Melania Del Santo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Schreiber_M/0/1/0/all/0/1">Matthias R. Schreiber</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Silvotti_R/0/1/0/all/0/1">Roberto Silvotti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Toonen_S/0/1/0/all/0/1">Silvia Toonen</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Villaver_E/0/1/0/all/0/1">Eva Villaver</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wyatt_M/0/1/0/all/0/1">Mark Wyatt</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Xu_S/0/1/0/all/0/1">Siyi Xu</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zwart_S/0/1/0/all/0/1">Simon Portegies Zwart</a>

Many white dwarf stars show signs of having accreted smaller bodies, implying
that they may host planetary systems. A small number of these systems contain
gaseous debris discs, visible through emission lines. We report a stable
123.4min periodic variation in the strength and shape of the CaII emission line
profiles originating from the debris disc around the white dwarf
SDSSJ122859.93+104032.9. We interpret this short-period signal as the signature
of a solid body held together by its internal strength.

http://arxiv.org/icons/sfx.gif