From European Southern Observatory: “Dancing with the Enemy”

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From European Southern Observatory

12 December 2018
Calum Turner
ESO Public Information Officer
Garching bei München, Germany
Tel: +49 89 3200 6670
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While testing a new subsystem on the SPHERE planet-hunting instrument on ESO’s Very Large Telescope, astronomers were able to capture dramatic details of the turbulent stellar relationship in the binary star R Aquarii with unprecedented clarity — even compared to observations from Hubble.

ESO SPHERE extreme adaptive optics system and coronagraphic facility on the extreme adaptive optics system and coronagraphic facility on the VLT MELIPAL UT3, Cerro Paranal, Chile, with an elevation of 2,635 metres (8,645 ft) above sea level

ESO SPHERE extreme adaptive optics system and coronagraphic facility on the extreme adaptive optics system and coronagraphic facility on the VLT UT3, Cerro Paranal, Chile, with an elevation of 2,635 metres (8,645 ft) above sea level

This spectacular image — the second installment in ESO’s R Aquarii Week [?] — shows intimate details of the dramatic stellar duo making up the binary star R Aquarii. Though most binary stars are bound in a graceful waltz by gravity, the relationship between the stars of R Aquarii is far less serene. Despite its diminutive size, the smaller of the two stars in this pair is steadily stripping material from its dying companion — a red giant.

Years of observation have uncovered the peculiar story behind the binary star R Aquarii, visible at the heart of this image. The larger of the two stars, the red giant, is a type of star known as a Mira variable. At the end of their life, these stars start to pulsate, becoming 1000 times as bright as the Sun as their outer envelopes expand and are cast into the interstellar void.

The death throes of this vast star are already dramatic, but the influence of the companion white dwarf star transforms this intriguing astronomical situation into a sinister cosmic spectacle. The white dwarf — which is smaller, denser and much hotter than the red giant — is flaying material from the outer layers of its larger companion. The jets of stellar material cast off by this dying giant and white dwarf pair can be seen here spewing outwards from R Aquarii.

Occasionally, enough material collects on the surface of the white dwarf to trigger a thermonuclear nova explosion, a titanic event which throws a vast amount of material into space. The remnants of past nova events can be seen in the tenuous nebula of gas radiating from R Aquarii in this image.

R Aquarii lies only 650 light-years from Earth — a near neighbour in astronomical terms — and is one of the closest symbiotic binary stars to Earth. As such, this intriguing binary has received particular attention from astronomers for decades. Capturing an image of the myriad features of R Aquarii was a perfect way for astronomers to test the capabilities of the Zurich IMaging POLarimeter (ZIMPOL), a component on board the planet-hunting instrument SPHERE. The results exceeded observations from space — the image shown here is even sharper than observations from the famous NASA/ESA Hubble Space Telescope.

R Aquarii viewed by the Very Large Telescope and Hubble
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While testing a new subsystem on the SPHERE planet-hunting instrument on ESO’s Very Large telescope, astronomers were able to capture dramatic details of the turbulent stellar relationship in the binary star R Aquarii with unprecedented clarity.

However, SPHERE was not the only instrument used in this research — in a striking example of telescope teamwork, SPHERE observations from the Very Large Telescope (VLT) were complemented by images from the Hubble Space Telescope’s Wide Field Camera 3 (WFC3).

NASA/ESA Hubble Telescope


NASA/ESA Hubble WFC3

The wide field of view and sensitivity of Hubble captured a large-scale image of R Aquarii, while high-resolution SPHERE/ZIMPOL observations revealed an unprecedentedly detailed view of the symbiotic binary at the centre of the scene.
Astronomers were able to take advantage of data from the Hubble Space Telescope, which fortuitously observed R Aquarii just days before the VLT SPHERE observations of the binary. This fortunate timing, in the words of the team, “provided a unique opportunity for improving the ZIMPOL flux measurements and the instrument throughput calibration”.
This image shows part of the wide-field observation from Hubble compared with the intricate details uncovered by the unparalleled observational capabilities of SPHERE and the VLT. Credit: ESO/Schmid et al./NASA/ESA

SPHERE was developed over years of studies and construction to focus on one of the most challenging and exciting areas of astronomy: the search for exoplanets. By using a state-of-the-art adaptive optics system and specialised instruments such as ZIMPOL, SPHERE can achieve the challenging feat of directly imaging exoplanets. However, SPHERE’s capabilities are not limited to hunting for elusive exoplanets. The instrument can also be used to study a variety of astronomical sources — as can be seen from this spellbinding image of the stellar peculiarities of R Aquarii.

More information

This research was presented in the paper “SPHERE / ZIMPOL observations of the symbiotic system R Aqr. I. Imaging of the stellar binary and the innermost jet clouds” by H.M. Schmid et. al, which was published in the journal Astronomy & Astrophysics.

The team was composed of H. M. Schmid (ETH Zurich, Institute for Astronomy, Switzerland), A. Bazzon (ETH Zurich, Institute for Astronomy, Switzerland), J. Milli (European Southern Observatory), R. Roelfsema (NOVA Optical Infrared Instrumentation Group at ASTRON, the Netherlands), N. Engler (ETH Zurich, Institute for Astronomy, Switzerland) , D. Mouillet (Université Grenoble Alpes and CNRS, France), E. Lagadec (Université Côte d’Azur, France), E. Sissa (INAF and Dipartimento di Fisica e Astronomia “G. Galilei” Universitá di Padova, Italy), J.-F. Sauvage (Aix Marseille Univ, France), C. Ginski (Leiden Observatory and Anton Pannekoek Astronomical Institute, the Netherlands), A. Baruffolo (INAF), J.L. Beuzit (Université Grenoble Alpes and CNRS, France), A. Boccaletti (LESIA, Observatoire de Paris, France), A. J. Bohn (ETH Zurich, Institute for Astronomy, Switzerland), R. Claudi (INAF, Italy), A. Costille (Aix Marseille Univ, France), S. Desidera (INAF, Italy), K. Dohlen (Aix Marseille Univ, France), C. Dominik (Anton Pannekoek Astronomical Institute, the Netherlands), M. Feldt (Max-Planck-Institut für Astronomie, Germany), T. Fusco (ONERA, France), D. Gisler (Kiepenheuer-Institut für Sonnenphysik, Germany), J.H. Girard (European Southern Observatory), R. Gratton (INAF, Italy), T. Henning (Max-Planck-Institut für Astronomie, Germany), N. Hubin (European Southern Observatory), F. Joos (ETH Zurich, Institute for Astronomy, Switzerland), M. Kasper (European Southern Observatory), M. Langlois (Centre de Recherche Astrophysique de Lyon and Aix Marseille Univ, France), A. Pavlov (Max-Planck-Institut für Astronomie, Germany), J. Pragt (NOVA Optical Infrared Instrumentation Group at ASTRON, the Netherlands), P. Puget (Université Grenoble Alpes, France), S.P. Quanz (ETH Zurich, Institute for Astronomy, Switzerland), B. Salasnich (INAF, Italy), R. Siebenmorgen (European Southern Observatory), M. Stute (Simcorp GmbH, Germany), M. Suarez (European Southern Observatory), J. Szulagyi (ETH Zurich, Institute for Astronomy, Switzerland), C. Thalmann (ETH Zurich, Institute for Astronomy, Switzerland), M. Turatto (INAF, Italy), S. Udry (Geneva Observatory, Switzerland), A. Vigan (Aix Marseille Univ, France), and F. Wildi (Geneva Observatory, Switzerland).

See the full article here .


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Leiden MASCARA cabinet at ESO Cerro la Silla located in the southern Atacama Desert 600 kilometres (370 mi) north of Santiago de Chile at an altitude of 2,400 metres (7,900 ft)

ESO Next Generation Transit Survey at Cerro Paranel, 2,635 metres (8,645 ft) above sea level

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ESO TAROT telescope at Paranal, 2,635 metres (8,645 ft) above sea level

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