Credit: ALMA(ESO/NAOJ/NRAO)/A. Ribas et al.
This image tells a story of redemption for a lonely star. The young
star MP Mus (PDS 66) was once thought to be all alone in the universe,
surrounded by nothing but a featureless band of gas and dust known as a
protoplanetary disc. In most cases, the material inside a protoplanetary
disc condenses to form new planets around the star, leaving large gaps
where the gas and dust used to be. These features are seen in almost
every disc — but not in MP Mus’.
When astronomers first observed it with the Atacama Large Millimeter/submillimeter Array (ALMA), they saw a smooth, planet-free disc, shown here in the right image. The team, led by Álvaro Ribas, an astronomer at the University of Cambridge, UK, gave this star another chance and re-observed it with ALMA at longer wavelengths that probe even deeper into the protoplanetary disc than before. These new observations, shown in the left image, revealed a gap and a ring that had been obscured in previous observations, suggesting that MP Mus might have company after all.
Meanwhile, another piece of the puzzle was being revealed in Germany as Miguel Vioque, an astronomer at ESO, studied this same star with the European Space Agency’s (ESA’s) Gaia mission. Vioque noticed something suspicious — the star was wobbling. A bit of gravitational detective work, together with insights from the new disc structures revealed by ALMA, showed that this motion could be explained by the presence of a gas giant exoplanet.
Both teams presented their joint results in a new paper published in Nature Astronomy. In what they describe as “a beautiful merging of two groups approaching the same object from different angles”, they show that MP Mus isn’t so boring after all.
When astronomers first observed it with the Atacama Large Millimeter/submillimeter Array (ALMA), they saw a smooth, planet-free disc, shown here in the right image. The team, led by Álvaro Ribas, an astronomer at the University of Cambridge, UK, gave this star another chance and re-observed it with ALMA at longer wavelengths that probe even deeper into the protoplanetary disc than before. These new observations, shown in the left image, revealed a gap and a ring that had been obscured in previous observations, suggesting that MP Mus might have company after all.
Meanwhile, another piece of the puzzle was being revealed in Germany as Miguel Vioque, an astronomer at ESO, studied this same star with the European Space Agency’s (ESA’s) Gaia mission. Vioque noticed something suspicious — the star was wobbling. A bit of gravitational detective work, together with insights from the new disc structures revealed by ALMA, showed that this motion could be explained by the presence of a gas giant exoplanet.
Both teams presented their joint results in a new paper published in Nature Astronomy. In what they describe as “a beautiful merging of two groups approaching the same object from different angles”, they show that MP Mus isn’t so boring after all.
Scientific Paper
Additional information
This text was adapted from a Picture of the Week published by the European Southern Observatory (ESO), an ALMA partner on behalf of Europe.
The Atacama Large Millimeter/submillimeter Array (ALMA), an
international astronomy facility, is a partnership of the European
Southern Observatory (ESO), the U.S. National Science Foundation (NSF),
and the National Institutes of Natural Sciences (NINS) of Japan in
cooperation with the Republic of Chile. ALMA is funded by ESO on behalf
of its Member States, by NSF in cooperation with the National Research
Council of Canada (NRC) and the National Science and Technology Council
(NSTC) in Taiwan, and by NINS in cooperation with the Academia Sinica
(AS) in Taiwan and the Korea Astronomy and Space Science Institute
(KASI).
ALMA construction and operations are led by ESO on behalf of its Member States; by the National Radio Astronomy Observatory (NRAO), managed by Associated Universities, Inc. (AUI), on behalf of North America; and by the National Astronomical Observatory of Japan (NAOJ) on behalf of East Asia. The Joint ALMA Observatory (JAO) provides the unified leadership and management of ALMA's construction, commissioning, and operation.
ALMA construction and operations are led by ESO on behalf of its Member States; by the National Radio Astronomy Observatory (NRAO), managed by Associated Universities, Inc. (AUI), on behalf of North America; and by the National Astronomical Observatory of Japan (NAOJ) on behalf of East Asia. The Joint ALMA Observatory (JAO) provides the unified leadership and management of ALMA's construction, commissioning, and operation.
Contacts:
Nicolás Lira
Education and Public Outreach Officer
Joint ALMA Observatory, Santiago - Chile
Phone: +56 2 2467 6519
Cel: +56 9 9445 7726
Email: nicolas.lira@alma.cl
