Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Lick's Automated Planet Finder: First robotic telescope for planet hunters

26.03.2014

In its first months of operation, the APF has found two new planetary systems, giving astronomers a taste of planetary riches to come

Lick Observatory's newest telescope, the Automated Planet Finder (APF), has been operating robotically night after night on Mt. Hamilton since January, searching nearby stars for Earth-sized planets. Every night the fully autonomous system checks the weather, decides which stars to observe, and moves the telescope from star to star throughout the night, collecting measurements that will reveal the presence of planets. Its technical performance has been outstanding, making it not only the first robotic planet-finding facility but also one of the most sensitive.


The Automated Planet Finder (APF) is the newest telescope at UC's Lick Observatory on Mt. Hamilton. (Photo by Laurie Hatch)

The search for planets beyond our solar system (called "extrasolar planets" or "exoplanets") has yielded a huge number of discoveries in recent years, especially since NASA's Kepler spacecraft joined ground-based telescopes in the effort. Unlike Kepler, however, which focused on distant stars in one small patch of sky, the APF focuses on nearby stars and covers the entire sky.

"The planetary systems we're finding are our nearest neighbors. Those are the ones that will matter to future generations," said Steve Vogt, professor of astronomy and astrophysics at UC Santa Cruz, who led the $12 million APF project and designed the Levy spectrometer at the heart of the system.

Vogt said it was a long and difficult road to get the APF facility completed, but now that it's up and running he couldn't be happier with its performance. Project manager and principal engineer Matthew Radovan of UC Observatories (UCO) oversaw a large team of UCO technical staff who provided crucial support for the construction and commissioning of the APF facility.

Sandra Faber, interim director of UC Observatories, said she was "absolutely thrilled" at the success of the APF. "Our UCO staff worked incredibly hard during the past year to get the new facility on the air. The APF is living proof that older observatory sites like Lick, which has been working for over 125 years, can still produce cutting-edge science," said Faber, a University professor of astronomy and astrophysics at UC Santa Cruz.

Vogt's team has submitted two papers describing new planetary systems recently discovered by the APF. A paper on the APF itself, with a full description of the system and details on how well it is performing, will be published April 1 in Publications of the Astronomical Society of the Pacific (available online at arXiv.org).

Optimized for planet hunting

The APF facility consists of a 2.4-meter telescope and the Levy Spectrometer, which Vogt designed and optimized specifically for planet hunting. The spectrometer takes starlight from the telescope and spreads it into a rainbow of colors, splitting the light into a spectrum of thousands of different wavelengths that can be measured with great precision. Repeated measurement of a star's spectrum enables astronomers to detect the tiny wobble induced in a star by the gravitational tug of an orbiting planet. The Levy Spectrometer was named in recognition of a gift to support its construction from the Gloria and Kenneth Levy Foundation.

"Steve Vogt has a long history of breaking barriers in the design and construction of the world's most sensitive and precise spectrometers. This time, he has outdone himself," said APF co-investigator Geoffrey Marcy, professor of astronomy at UC Berkeley. "With the Automated Planet Finder, he has not only built a highly efficient and precise planet-hunting spectrometer, but he also led the construction of the world's first robotic telescope tuned finely enough to feed such a spectrometer."

Greg Laughlin, professor and chair of astronomy and astrophysics at UCSC, said the APF is a world-class facility perfectly suited to detecting planets in our neighborhood of the galaxy. Laughlin and his students (primarily Stefano Meschiari, now at the University of Texas, Austin) developed the software package, called Systemic Console, that researchers use to pull planet discoveries out of the data acquired by the APF and other telescopes.

"The vast majority of planets reveal themselves over time through a series of measurements, and the signals are buried in the huge stream of data that comes back from the telescope every night, so this software package is an integral part of the detection process," Laughlin said. "APF is the best current planet-finding instrument that can see the sky above our hemisphere. It's remarkable that this cutting-edge research can be done within sight of Silicon Valley--you don't have to go to Hawaii or Chile."

Vogt also designed spectrometers for the Keck I Telescope in Hawaii and Lick's Shane Telescope--both of which have been highly productive planet-finding instruments. In many ways, however, the APF is a more powerful planet finder than even the 10-meter Keck telescope because the APF was custom-built for that purpose, Vogt said. The precision with which the APF can measure the motion of a star is much better than can be achieved at Keck. The APF's telescope is relatively small, but with modern optical technology, including special coatings on the mirrors, its optical efficiency is very high.

"We can do the same work we did at Keck, except now we have the APF every night instead of just a few nights per month at Keck," Vogt said. "What we're learning from all of this--from Kepler and from our own work--is that there's a huge number of planets out there, more planets than there are stars, and they're everywhere, including right next door to us."

The first two planetary systems detected by the APF were initially suspected based on data Vogt's team got at Keck, but were only confirmed after repeated observations with the APF. One of the systems (HD 141399) consists of four gas giant planets, similar to the four gas giants in our solar system except that their orbits are much closer to their star. The other system (GJ 687) features a Neptune-mass planet orbiting a red dwarf star. These are "garden variety systems," not dramatic discoveries, Vogt said. But APF has the sensitivity to detect the ultimate goal--an Earth-sized planet orbiting a nearby star in the habitable zone, where it is neither too hot nor too cold for liquid water on the planet's surface.

"APF will be a marvelous facility for finding potentially habitable Earth-sized planets around our nearest stellar neighbors," said Vogt's longtime collaborator Paul Butler of the Carnegie Institution of Washington.

The APF will also be useful for a wide range of conventional astronomical observations involving spectroscopy, including follow-up observations of bright supernova explosions and gamma-ray bursts that may brighten and dim quickly. "The robotic APF can wheel over to these stupendous cosmic explosions within seconds to allow spectroscopic analysis of their brilliant flash of light," Marcy said.

About 20 percent of the APF's time is set aside for purposes other than planet finding, with access to be allocated by the director of UC Observatories. The rest of the observing time is divided equally between the planet search teams led by Vogt and Marcy.

Funding for the APF came from several sources, including $6.4 million in Congressional ear-mark funding through the U.S. Naval Observatory. Additional funding was provided by grants from NASA and the National Science Foundation, as well as gifts from several private donors.

Tim Stephens | EurekAlert!
Further information:
http://news.ucsc.edu/2014/03/apf-telescope.html

Further reports about: Planet astronomy astrophysics construction observations spectrometers

More articles from Physics and Astronomy:

nachricht Distant planet's interior chemistry may differ from our own
01.09.2015 | Carnegie Institution

nachricht Interstellar seeds could create oases of life
28.08.2015 | Harvard-Smithsonian Center for Astrophysics

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: An engineered surface unsticks sticky water droplets

The leaves of the lotus flower, and other natural surfaces that repel water and dirt, have been the model for many types of engineered liquid-repelling surfaces. As slippery as these surfaces are, however, tiny water droplets still stick to them. Now, Penn State researchers have developed nano/micro-textured, highly slippery surfaces able to outperform these naturally inspired coatings, particularly when the water is a vapor or tiny droplets.

Enhancing the mobility of liquid droplets on rough surfaces could improve condensation heat transfer for power-plant heat exchangers, create more efficient...

Im Focus: Increasingly severe disturbances weaken world's temperate forests

Longer, more severe, and hotter droughts and a myriad of other threats, including diseases and more extensive and severe wildfires, are threatening to transform some of the world's temperate forests, a new study published in Science has found. Without informed management, some forests could convert to shrublands or grasslands within the coming decades.

"While we have been trying to manage for resilience of 20th century conditions, we realize now that we must prepare for transformations and attempt to ease...

Im Focus: OU astrophysicist and collaborators find supermassive black holes in quasar nearest Earth

A University of Oklahoma astrophysicist and his Chinese collaborator have found two supermassive black holes in Markarian 231, the nearest quasar to Earth, using observations from NASA's Hubble Space Telescope.

The discovery of two supermassive black holes--one larger one and a second, smaller one--are evidence of a binary black hole and suggests that supermassive...

Im Focus: What would a tsunami in the Mediterranean look like?

A team of European researchers have developed a model to simulate the impact of tsunamis generated by earthquakes and applied it to the Eastern Mediterranean. The results show how tsunami waves could hit and inundate coastal areas in southern Italy and Greece. The study is published today (27 August) in Ocean Science, an open access journal of the European Geosciences Union (EGU).

Though not as frequent as in the Pacific and Indian oceans, tsunamis also occur in the Mediterranean, mainly due to earthquakes generated when the African...

Im Focus: Self-healing landscape: landslides after earthquake

In mountainous regions earthquakes often cause strong landslides, which can be exacerbated by heavy rain. However, after an initial increase, the frequency of these mass wasting events, often enormous and dangerous, declines, in fact independently of meteorological events and aftershocks.

These new findings are presented by a German-Franco-Japanese team of geoscientists in the current issue of the journal Geology, under the lead of the GFZ...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Networking conference in Heidelberg for outstanding mathematicians and computer scientists

20.08.2015 | Event News

Scientists meet in Münster for the world’s largest Chitin und Chitosan Conference

20.08.2015 | Event News

Large agribusiness management strategies

19.08.2015 | Event News

 
Latest News

Siemens sells 18 industrial gas turbines to Thailand

01.09.2015 | Press release

An engineered surface unsticks sticky water droplets

01.09.2015 | Materials Sciences

New material science research may advance tech tools

01.09.2015 | Materials Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>