From European Southern Observatory: “First Light for SPECULOOS”

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From European Southern Observatory

5 December 2018

Michaël Gillon
SPECULOOS Principal Investigator
University of Liège, Belgium
Tel: +32 4366 9743
Cell: +32 473 346 402
Email: michael.gillon@uliege.be

Didier Queloz
SPECULOOS co-Principal Investigator, University of Cambridge
UK
Tel: +44 7746 010890
Email: dq212@cam.ac.uk

Calum Turner
ESO Public Information Officer
Garching bei München, Germany
Tel: +49 89 3200 6655
Cell: +49 151 1537 3591
Email: pio@eso.org

Four telescopes devoted to the search for habitable planets around nearby ultra-cool stars get off to a successful start at ESO’s Paranal Observatory.

SPECULOOS four 1m-diameter robotic telescopes 2016 in the ESO Paranal Observatory, 2,635 metres (8,645 ft) above sea level

SPECULOOS four 1m-diameter robotic telescopes 2016 in the ESO Paranal Observatory, 2,635 metres (8,645 ft) above sea levelfrom SPECULOOS website

ESO First Light for SPECULOOS official photo

The SPECULOOS project has made its first observations at the European Southern Observatory’s Paranal Observatory in northern Chile. SPECULOOS will focus on detecting Earth-sized planets orbiting nearby ultra-cool stars and brown dwarfs.

1
This first light image from the Europa telescope at the SPECULOOS Southern Observatory (SSO) shows the heart of the Carina Nebula.

The SSO is installed at ESO’s Paranal Observatory in the vast Atacama Desert, Chile, and consists of four 1-metre planet-hunting telescopes. The project’s telescopes are named after Jupiter’s Galilean moons, and are neighbours of ESO’s Very Large Telescope and VISTA. SPECULOOS will focus on detecting Earth-sized planets orbiting nearby ultra-cool stars and brown dwarfs. Credit: SPECULOOS Team/E. Jehin/ESO

The SPECULOOS Southern Observatory (SSO) has been successfully installed at the Paranal Observatory and has obtained its first engineering and calibration images — a process known as first light. After finishing this commissioning phase, this new array of planet-hunting telescopes will begin scientific operations, starting in earnest in January 2019.

SSO is the core facility of a new exoplanet-hunting project called Search for habitable Planets EClipsing ULtra-cOOl Stars (SPECULOOS) [1], and consists of four telescopes equipped with 1-metre primary mirrors. The telescopes — named Io, Europa, Ganymede and Callisto after the four Galilean moons of Jupiter — will enjoy pristine observing conditions at the Paranal site, which is also home to ESO’s flagship Very Large Telescope (VLT). Paranal provides a near-perfect site for astronomy, with dark skies and a stable, arid climate.

These telescopes have a momentous task — SPECULOOS aims to search for potentially habitable Earth-sized planets surrounding ultra-cool stars or brown dwarfs, whose planetary populations are still mostly unexplored. Only a few exoplanets have been found orbiting such stars, and even fewer lie within their parent star’s habitable zone. Even though these dim stars are hard to observe, they are abundant — comprising about 15% of the stars in the nearby universe. SPECULOOS is designed to explore 1000 such stars, including the nearest, brightest, and smallest, in search of Earth-sized habitable planets.

“SPECULOOS gives us an unprecedented ability to detect terrestrial planets eclipsing some of our smallest and coolest neighbouring stars,” elaborated Michaël Gillon of the University of Liège, principal investigator of the SPECULOOS project. “This is a unique opportunity to uncover the details of these nearby worlds.”

SPECULOOS will search for exoplanets using the transit method [2], following the example of its prototype TRAPPIST-South telescope at ESO’s La Silla Observatory.

ESO Belgian robotic Trappist-South National Telescope at Cerro La Silla, Chile, 600 km north of Santiago de Chile at an altitude of 2400 metres.

Planet transit. NASA/Ames

That telescope has been operational since 2011 and detected the famous TRAPPIST-1 planetary system.

A size comparison of the planets of the TRAPPIST-1 system, lined up in order of increasing distance from their host star. The planetary surfaces are portrayed with an artist’s impression of their potential surface features, including water, ice, and atmospheres. NASA

As a planet passes in front of its star it blocks some of the star’s light — essentially causing a small partial eclipse — resulting in a subtle but detectable dimming of the star. Exoplanets with smaller host stars block more of their star’s light during a transit, making these periodic eclipses much easier to detect than those associated with larger stars.

Thus far, only a small fraction of the exoplanets detected by this method have been Earth-sized or smaller. However, the small size of the SPECULOOS target stars combined with the high sensitivity of its telescopes allows detection of Earth-sized transiting planets located in the habitable zone. These planets will be ideally suited for follow-up observations with large ground- or space-based facilities.

“The telescopes are kitted out with cameras that are highly sensitive in the near-infrared,” explained Laetitia Delrez of the Cavendish Laboratory, Cambridge, a co-investigator in the SPECULOOS team. “This radiation is a little beyond what human eyes can detect, and is the primary emission from the dim stars SPECULOOS will be targeting.”

The telescopes and their brightly coloured mounts were built by the German company ASTELCO and are protected by domes made by the Italian manufacturer Gambato. The project will receive support from the two TRAPPIST 60-cm telescopes, one at ESO’s La Silla Observatory and the other in Morocco [3]. The project will in due course also include the SPECULOOS Northern Observatory and SAINT-Ex, which are currently under construction in Tenerife, Spain, and at San Pedro Mártir, Mexico, respectively.

There is also potential for an exciting future collaboration with the Extremely Large Telescope (ELT), ESO’s future flagship telescope, currently under construction on Cerro Armazones. The ELT will be able to observe planets detected by SPECULOOS in unprecedented detail — perhaps even analysing their atmospheres.

“These new telescopes will allow us to investigate nearby Earth-like worlds in the Universe in greater detail than we could have imagined only ten years ago,” concluded Gillon. “These are tremendously exciting times for exoplanet science.”

Notes

[1] Speculoos, or speculaas, is a delicious type of spiced biscuit traditionally baked in Belgium and other countries for Saint Nicholas’s day on December 6. The name, with its sweet connotations, reflects the Belgian origins of the SPECULOOS project. The TRAPPIST project also has a similar Belgian namesake — it was named after Trappist beers, most of which are brewed in Belgium.

[2] The transit method is one of several ways exoplanets are discovered. A variety of instruments, including ESO’s planet-hunting HARPS spectrograph at the La Silla Observatory, use the radial velocity method to detect exoplanets, measuring changes in a star’s velocity due to an orbiting exoplanet.

[3] SSO also received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007-2013)/ ERC grant agreement number 336480, from the Simons and MERAC Foundations, and from private sponsors.

Links

SPECULOOS website

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ESO is the foremost intergovernmental astronomy organisation in Europe and the world’s most productive ground-based astronomical observatory by far. It is supported by 16 countries: Austria, Belgium, Brazil, the Czech Republic, Denmark, France, Finland, Germany, Italy, the Netherlands, Poland, Portugal, Spain, Sweden, Switzerland and the United Kingdom, along with the host state of Chile. ESO carries out an ambitious programme focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organising cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope, the world’s most advanced visible-light astronomical observatory and two survey telescopes. VISTA works in the infrared and is the world’s largest survey telescope and the VLT Survey Telescope is the largest telescope designed to exclusively survey the skies in visible light. ESO is a major partner in ALMA, the largest astronomical project in existence. And on Cerro Armazones, close to Paranal, ESO is building the 39-metre EEuropean Extremely Large Telescope, the E-ELT, which will become “the world’s biggest eye on the sky”.

ESO La Silla HELIOS (HARPS Experiment for Light Integrated Over the Sun)

ESO/HARPS at La Silla

ESO 3.6m telescope & HARPS at Cerro LaSilla, Chile, 600 km north of Santiago de Chile at an altitude of 2400 metres.

ESO 2.2 meter telescope at La Silla, 600 km north of Santiago de Chile at an altitude of 2400 metres.

ESO/Cerro LaSilla, 600 km north of Santiago de Chile at an altitude of 2400 metres.

ESO VLT Platform at Cerro Paranal elevation 2,635 m (8,645 ft)


ESO VLT 4 lasers on Yepun

Glistening against the awesome backdrop of the night sky above ESO_s Paranal Observatory, four laser beams project out into the darkness from Unit Telescope 4 UT4 of the VLT.

ESO/NTT at Cerro La Silla, Chile, at an altitude of 2400 metres



ESO/Vista Telescope at Cerro Paranal, with an elevation of 2,635 metres (8,645 ft) above sea level

ESO/NRAO/NAOJ ALMA Array in Chile in the Atacama at Chajnantor plateau, at 5,000 metres

ESO/E-ELT,to be on top of Cerro Armazones in the Atacama Desert of northern Chile. located at the summit of the mountain at an altitude of 3,060 metres (10,040 ft).

ESO/APEX high on the Chajnantor plateau in Chile’s Atacama region, at an altitude of over 4,800 m (15,700 ft)

Leiden MASCARA instrument, 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)

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

SPECULOOS four 1m-diameter robotic telescopes 2016 in the ESO Paranal Observatory, 2,635 metres (8,645 ft) above sea level

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

ESO ExTrA telescopes at Cerro LaSilla at an altitude of 2400 metres