Single-object Imaging and Spectroscopy to Enhance Dark Energy Science from LSST.

Single-object imaging and spectroscopy on telescopes with apertures ranging from ~4 m to 40 m have the potential to greatly enhance the cosmological constraints that can be obtained from LSST. Two major cosmological probes will benefit greatly from LSST follow-up: accurate spectrophotometry for nearby and distant Type Ia supernovae will expand the cosmological distance lever arm by unlocking the constraining power of high-z supernovae; and cosmology with time delays of strongly-lensed supernovae and quasars will require additional high-cadence imaging to supplement LSST, adaptive optics imaging or spectroscopy for accurate lens and source positions, and IFU or slit spectroscopy to measure detailed properties of lens systems. We highlight the scientific impact of these two science drivers, and discuss how additional resources will benefit them. For both science cases, LSST will deliver a large sample of objects over both the wide and deep fields in the LSST survey, but additional data to characterize both individual systems and overall systematics will be key to ensuring robust cosmological inference to high redshifts. Community access to large amounts of natural-seeing imaging on ~2-4 m telescopes, adaptive optics imaging and spectroscopy on 8-40 m telescopes, and high-throughput single-target spectroscopy on 4-40 m telescopes will be necessary for LSST time domain cosmology to reach its full potential. In two companion white papers we present the additional gains for LSST cosmology that will come from deep and from wide-field multi-object spectroscopy.

[1]  Michelle Lochner,et al.  Wide-field Multi-object Spectroscopy to Enhance Dark Energy Science from LSST Thematic , 2019 .

[2]  Michelle Lochner,et al.  Deep Multi-object Spectroscopy to Enhance Dark Energy Science from LSST , 2019, 1903.09325.

[3]  C. Tao,et al.  SNEMO: Improved Empirical Models for Type Ia Supernovae , 2018, The Astrophysical Journal.

[4]  Daniel A. Goldstein,et al.  Rates and Properties of Strongly Gravitationally Lensed Supernovae and their Host Galaxies in Time-Domain Imaging Surveys , 2018 .

[5]  David Alonso,et al.  The LSST Dark Energy Science Collaboration (DESC) Science Requirements Document , 2018, 1809.01669.

[6]  M. Sullivan,et al.  Euclid: Superluminous supernovae in the Deep Survey , 2017, 1710.09585.

[7]  G. Pignata,et al.  SN 2016jhj at redshift 0.34: extending the Type II supernova Hubble diagram using the standard candle method , 2017, 1709.01513.

[8]  T. Collett,et al.  Precise Time Delays from Chromatically Microlensed Type Ia Supernovae , 2017 .

[9]  T. Collett,et al.  Precise Time Delays from Strongly Gravitationally Lensed Type Ia Supernovae with Chromatically Microlensed Images , 2017, 1708.00003.

[10]  E. Bellm,et al.  The unblinking eye on the sky , 2017, Nature Astronomy.

[11]  R. Nichol,et al.  Dynamical dark energy in light of the latest observations , 2017, Nature Astronomy.

[12]  Adam A. Miller,et al.  iPTF16geu: A multiply imaged, gravitationally lensed type Ia supernova , 2016, Science.

[13]  Puragra Guhathakurta,et al.  Maximizing Science in the Era of LSST: A Community-Based Study of Needed US Capabilities , 2016, 1610.01661.

[14]  Adam G. Riess,et al.  The trouble with H0 , 2016, 1607.05617.

[15]  G. Meylan,et al.  H0LiCOW - V. New COSMOGRAIL time delays of HE 0435-1223: H0 to 3.8 per cent precision from strong lensing in a flat ΛCDM model , 2016, 1607.01790.

[16]  A. Melchiorri,et al.  Reconciling Planck with the local value of H0 in extended parameter space , 2016, 1606.00634.

[17]  T. Collett,et al.  Observational selection biases in time-delay strong lensing and their impact on cosmography , 2016, 1605.08341.

[18]  P. Marshall,et al.  Time delay cosmography , 2016, The Astronomy and Astrophysics Review.

[19]  C. A. Oxborrow,et al.  Planck intermediate results. XLVI. Reduction of large-scale systematic effects in HFI polarization maps and estimation of the reionization optical depth , 2016, 1605.02985.

[20]  Brad E. Tucker,et al.  A 2.4% DETERMINATION OF THE LOCAL VALUE OF THE HUBBLE CONSTANT , 2016, 1604.01424.

[21]  C. Tao,et al.  IMPROVING COSMOLOGICAL DISTANCE MEASUREMENTS USING TWIN TYPE IA SUPERNOVAE , 2015, 1511.01102.

[22]  C. A. Oxborrow,et al.  Planck2015 results , 2015, Astronomy & Astrophysics.

[23]  A. Fontana,et al.  Multiple images of a highly magnified supernova formed by an early-type cluster galaxy lens , 2014, Science.

[24]  Adam D. Myers,et al.  Cosmological implications of baryon acoustic oscillation measurements , 2014, 1411.1074.

[25]  G. Efstathiou.  H 0 revisited , 2013, 1311.3461.

[26]  E. Linder.  Lensing time delays and cosmological complementarity , 2011, 1109.2592.

[27]  D. Sluse,et al.  Strong Lensing by Galaxies , 2010, 1003.5567.

[28]  Ucsb,et al.  Gravitationally lensed quasars and supernovae in future wide-field optical imaging surveys , 2010, 1001.2037.

[29]  C. Fassnacht,et al.  Galaxy Number Counts and Implications for Strong Lensing , 2009, 0909.4301.

[30]  C. Bennett.  Cosmology at a Crossroads , 2009, Science.

[31]  E. Linder.  Strong gravitational lensing and dark energy complementarity , 2004, astro-ph/0401433.

[32]  M. Oguri,et al.  Gravitational lens time delays for distant supernovae: breaking the degeneracy between radial mass profiles and the Hubble constant , 2002, astro-ph/0211499.

[33]  C. Kochanek.  What Do Gravitational Lens Time Delays Measure? , 2002, astro-ph/0205319.

[34]  P. Schneider,et al.  Cosmological Applications of Gravitational Lensing , 1995, astro-ph/9512047.

[35]  M. Gorenstein.  The gravitational lens effect , 1988 .

[36]  S. Refsdal.  On the possibility of determining Hubble's parameter and the masses of galaxies from the gravitational lens effect , 1964 .