Fringe tracking at the MROI

Jurgenson, C. A.; Santoro, Fernando; Baron, Fabien; McCord, K.; Block, Erica; Buscher, David F.; Haniff, C.; Young, John S.; Coleman, T. A.; Creech‐Eakman, M. J.

doi:10.1117/12.788223

Cited by 15 publications

(7 citation statements)

References 9 publications

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“…We find that most infrared transit observations by JWST (Cowan et al 2015;Stevenson et al 2016) and other current and near-future platforms, such as NESSI (Jurgenson et al 2010) and ARIEL (Puig et al 2016), are unaffected by stellar variability, except for rare cases where the target is bright, relatively active, and has a large transit depth (e.g., HD 189733b or, alternatively, targets with a ∼1% transit depth orbiting bright M-dwarfs). This conclusion is qualitatively in agreement with a study of the effects of stellar variability on the atmospheric retrievals of JWST transit spectroscopy observed at different epochs and observing modes (Barstow et al 2015).…”

Section: Forecasting the Effect Of Stellar Activity On Other Instrumentsmentioning

confidence: 60%

“…Thus, our study anticipates additional future, repeated high-precision spectroscopic transit measurements to observe stellar variations in exoplanet host stars such as with the New Mexico Exoplanet Spectroscopic Survey Instrument (NESSI; Jurgenson et al 2010), which will commence a survey of ∼30 transiting exoplanets on the 200 inch Hale Telescope at Palomar Observatory within the next year; ESA's Atmospheric Remote-sensing Exoplanet Large-survey (ARIEL), a proposed dedicated transiting exoplanet survey that will repeatedly measure the spectra (∼2-8 μm) of hundreds of exoplanets with multiple visits (Puig et al 2016;Tinetti et al 2016); and JWST, which will measure the infrared spectra of tens of transiting exoplanets (Cowan et al 2015;Stevenson et al 2016). …”

Section: Introductionmentioning

confidence: 94%

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Forecasting the Impact of Stellar Activity on Transiting Exoplanet Spectra

Zellem

Swain

Roudier

et al. 2017

ApJ

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Exoplanet host star activity, in the form of unocculted starspots or faculae, alters the observed transmission and emission spectra of the exoplanet. This effect can be exacerbated when combining data from different epochs if the stellar photosphere varies between observations due to activity. Here, we present a method to characterize and correct for relative changes due to stellar activity by exploiting multi-epoch (2 visits/transits) observations to place them in a consistent reference frame. Using measurements from portions of the planet's orbit where negligible planet transmission or emission can be assumed, we determine changes to the stellar spectral amplitude. With the analytical methods described here, we predict the impact of stellar variability on transit observations. Supplementing these forecasts with Kepler-measured stellar variabilities for F-, G-, K-, and M-dwarfs, and predicted transit precisions by the James Webb Space Telescope's (JWST) NIRISS, NIRCam, and MIRI, we conclude that stellar activity does not impact infrared transiting exoplanet observations of most presently known or predicted TESS targets by current or near-future platforms, such as JWST, as activity-induced spectral changes are below the measurement precision.

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Section: Forecasting the Effect Of Stellar Activity On Other Instrumentsmentioning

confidence: 60%

Section: Introductionmentioning

confidence: 94%

Forecasting the Impact of Stellar Activity on Transiting Exoplanet Spectra

Zellem

Swain

Roudier

et al. 2017

ApJ

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“…The beam combiner optics are Infrasil 301 and have custom coatings optimized to manage issues associated with intensity mismatch, s/p polarization differences and group delay differences between the beams to be combined. For more details on the fringe tracker see Jurgenson et al 8 and for the custom coatings on the beam combiner optics Block et al 9 both in these proceedings. Final design review on the fringe tracking system is scheduled for early 2009 with several long-lead items already being procured.…”

Section: Fringe Tracker and Fringe-tracking Beam Combinermentioning

confidence: 99%

Magdalena Ridge Observatory Interferometer: progress toward first light

et al. 2008

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The Magdalena Ridge Observatory Interferometer is a 10-element 1.4 meter aperture optical and near-infrared interferometer being built at 3,200 meters altitude on Magdalena Ridge, west of Socorro, NM. The interferometer layout is an equilateral "Y" configuration to complement our key science mission, which is centered around imaging faint and complex astrophysical targets. This paper serves as an overview and update on the status of the observatory and our progress towards first light and first fringes in the next few years. MAGDALENA RIDGE OBSERVATORYThe Magdalena Ridge Observatory is a Federally Funded facility being built and managed by New Mexico Institute of Mining and Technology (NMT) which also serves as host for the observatory offices on the NMT campus in Socorro, NM. The observatory consists of two major facilities: a fast-tracking 2.4 m telescope and an optical interferometer. The 2.4 m telescope obtained first light on Oct. 31, 2006 and is currently moving into full operations. It is a superb instrument for the study of fast-moving objects and targets of opportunity, owing to its very high slew and tracking rates; its operations are currently funded 30% by NASA for NearEarth Object follow-on studies 1 . The optical interferometer is being designed and built in collaboration with our partners at the University of Cambridge, Cavendish Lab. In this last development phase the interferometer is moving towards a first fringes date in late 2010. Phase A of the interferometer build will include 6 telescopes and infrared fringe-tracking and scientific imaging capabilities. Phase B will add 4 more telescopes and associated beam trains, visible operations, and will have an additional location in the beam combining laboratory for guest instruments. (See Figure 1 for views of the two facilities.) The greater observatory facilities include over 8 miles of maintained road, on-site water, power, ethernet, housing facilities and a location on the Ridge for a third scientific facility yet to be determined.

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“…The ultra-stable MROI design is completely non-actuated save for its modulating mirrors, and has demonstrated excellent opto-mechanical stability even when tested in a university laboratory environment with no temperature or vibration control. Previous proceedings (Jurgenson et al 2008and McCracken et al 2012, Santoro et al 2012 have detailed the design and plans for laboratory testing of the ICoNN system. Use of ICoNN will enable the MROI science case, which has been recently expanded to include studies of geosynchronous satellites , especially as implemented in the 10 telescope MROI deployment.…”

Section: Fringe-tracker Systemmentioning

confidence: 99%

Magdalena Ridge Observatory Interferometer: status update

Creech‐Eakman

Bakker

Buscher

et al. 2006

Advances in Stellar Interferometry

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The Magdalena Ridge Observatory Interferometer has been designed to be a 10 × 1.4 m aperture long-baseline optical/near-infrared interferometer in an equilateral "Y" configuration, and is being deployed west of Socorro, NM on the Magdalena Ridge. Unfortunately, first light for the facility has been delayed due to the current difficult funding regime, but during the past two years we have made substantial progress on many of the key subsystems for the array. The design of all these subsystems is largely complete, and laboratory assembly and testing, and the installation and site acceptance testing of key components on the Ridge are now underway. This paper serves as an overview and update on the facility's present status and changes since 2012, and the plans for future activities and eventual operations of the facilities.

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Fringe tracking at the MROI

Cited by 15 publications

References 9 publications

Forecasting the Impact of Stellar Activity on Transiting Exoplanet Spectra

Forecasting the Impact of Stellar Activity on Transiting Exoplanet Spectra

Magdalena Ridge Observatory Interferometer: progress toward first light

Magdalena Ridge Observatory Interferometer: status update

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