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Yale Astronomy

Commissioning - Phase 2

May 5, 2018 - John Brewer and Debra Fischer

We are seeing significant leaps in progress with each trip to the telescope. EXPRES has been locked in a vacuum enclosure for two months now, and we continue to overcome minor technical issues and work on software.

This trip, John Brewer stayed at the DCT Lodge [1] and worked on upgrades to the motor controls, data-taking GUI [2] and the guiding system. John and Natalia collected data with the Discover Channel Telescope with the light of a full moon [3] when it wasn't snowing [4]. Tilo Steinmetz (Menlo Systems in Germany) visited and improved the stability of the laser frequency comb [5]. Back at Yale we improved the quantum efficiency map of our detector and supported John by collecting the calibration data at the beginning and end of each night. The number of glitches and crashes is decreasing every night and on the final night of the run, May 5th, the observations ran smoothly!

May 5, 2018 Slideshow

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The DCT G-M Lodge for researchers
The EXPRES data-taking GUI
Full Moon and Jupiter
Snowing in May at the DCT
Image of the Laser Frequency Comb
The DCT G-M Lodge for researchers
The EXPRES data-taking GUI
Full Moon and Jupiter

The moment of truth

April 2, 2018 - Debra Fischer

I am always struck by the beauty of observatories. Telescopes are engineering monuments to humankind's curiosity about the universe. The questions are so big and the answers are often so surprising. Research telescopes are typically in remote locations, far away from the night lights of civilization, and on mountaintops where the air flow is steady for clearer images. The Lowell Observatory Discovery Channel Telescope (DCT) is located about 40 miles SE of Flagstaff Arizona and for the inaugural 2-week commissioning run, I stayed at the Giovale-Millis lodge [1], a log cabin that the astronomers and telescope operators use when observing at night and sleeping during the day. A pair of bald eagles soar over this territory and herds of elk roam through the Coconino Forest, our front yard.

Years of work went into EXPRES and as I look at this instrument, I am surprised that I ever had the audacity to start this project. The moment of truth starts now. It will take us a few more months of collecting and analyzing data to know if we made the right design decisions and I feel both humbled and hopeful. I'm proud of the fact that our design decisions were driven by evidence gleaned from many years of experience. But did I forget anything?

The team deserves a huge shout-out for their unflagging efforts. Even with the time difference between Arizona and the east coast, Andy, Ryan, and John joined in on the observations remotely, jumping in to make any needed software fixes. Grad students Lily and Allen worked day and night at Yale to obtain calibration images. There was also support at the observatory from the Lowell telescope operators (Heidi, Andrew and Jason). At one point, we were rescued by Tilo Steinmetz (Menlo Systems) who logged in from Switzerland during Easter vacation with his family to get the laser comb re-aligned. And I am incredilby grateful to my son, Ben [2], who came out to construct the thermal enclosure that surrounds the vacuum chamber.

Undergrad Yonatan Zeff [3] worked for the first nights of this inaugural observing run and we had a fun visit by Yale alum Jack Moses and his wife [4]. We immediately put Anne to work [5], and Jack installed a Storm Trooper [6] to watch over the laser frequency comb. Jack sent us some of the spectacular pictures below. It's wonderful to see our research [7,8] through the fresh eyes of our guests!

Apr 2, 2018 Slideshow

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The DCT G-M Lodge for researchers
Ben Fischer building the thermal enclosure — all those Lego toys paid off!
Undergrad Yonatan Zeff and Prof Debra Fischer
Yale Alum, Jack and Anne Moses
Anne Moses - everyone pitches in!
A Stormtrooper, guarding the laser frequency comb
Close-up of the DCT telescope
DCT dome at dusk

EXPRES in the Press

March 13, 2018 - Lily Zhao We are excited to begin our blog with a press release for its namesake: the Extreme PREcision Spectrograph (EXPRES), designed, built, and commissioned by Yale astronomers. It was three years ago that funding for the instrument was won through the National Science Foundation's Major Research Instrumentation program, but together the team has collectively rolled decades of experience into EXPRES.

News about EXPRES can be found at the following sites:

About Us

Photo from Lowell Observatory

The EXPRES team works on the discovery of planets orbiting stars other than our Sun, or exoplanets.

EXPRES is a next generation spectrograph that aims to break the record on current measurement precision with the goal of detecting small, rocky planets - similar to Earth - orbiting nearby stars. The instrument blends high resolution and extraordinary stability to produce the highest fidelity data.

This journey began long ago; our hope is that EXPRES will help humanity to explore the unknowns in the galaxy.

EXPRES Cast and Crew

  • Professors
    • Debra Fischer, Astronomy
    • Jessi Cisewski, Statistics
  • Research Scientists
    • Colby Jurgenson
    • Tyler McCracken
    • David Sawyer
    • Andrew Szymkowiak
  • Postdoctoral Associates and Fellows
    • John Michael Brewer
  • Graduate Students
    • Allen Davis
    • Ryan Blackman
    • Ryan Petersburg
    • Lily Zhao
    • Joel Ong
  • Undergraduate Students
    • Christopher Leet
    • Yonatan Zeff
    • Abby Mintz
  • Collaborators
    • Sally Dodson-Robinson, University of Delaware
    • Lars Buchhave, Danish National Space Institute
    • Gregory Henry, Tennessee State University
  • We Would Like to Expressly Thank
    • Steve Girvin, Yale University
    • Pieter van Dokkum, Yale University
    • Gábor Fűrész, MIT
    • Andy Szentgyorgyi, Harvard
    • Francesco Pepe, Geneva Observatory
    • Matteo Genoni, Brera Astronomical Observatory
    • Giorgio Pariani, Brera Astronomical Observatory
    • Marco Riva, Brera Astronomical Observatory
    • Ben Hardesty, Lowell Observatory
    • Frank Cornelius, Lowell Observatory
  • Support

    Support for this project has come from and the generosity of the Yale alumni Community.