2019PASP..131g5001R


Query : 2019PASP..131g5001R

2019PASP..131g5001R - Publ. Astron. Soc. Pac., 131, part no 7, 5001-75001 (2019/July-0)

Building the Evryscope: hardware design and performance.

RATZLOFF J.K., LAW N.M., FORS O., CORBETT H.T., HOWARD W.S., DEL SER D. and HAISLIP J.

Abstract (from CDS):

The Evryscope is a telescope array designed to open a new parameter space in optical astronomy, detecting short-timescale events across extremely large sky areas simultaneously. The system consists of a 780 MPix 22-camera array with an 8150 sq. deg. field of view, 13'' per pixel sampling, and the ability to detect objects down to m_g^′^≃16 in each 2-minute dark-sky exposure. The Evryscope, covering 18,400 sq. deg. with hours of high-cadence exposure time each night, is designed to find the rare events that require all-sky monitoring, including transiting exoplanets around exotic stars like white dwarfs and hot subdwarfs, stellar activity of all types within our galaxy, nearby supernovae, and other transient events such as gamma-ray bursts and gravitational-wave electromagnetic counterparts. The system averages 5000 images per night with ∼300,000 sources per image, and to date has taken over 3.0M images, totaling 250 TB of raw data. The resulting light curve database has light curves for 9.3M targets, averaging 32,600 epochs per target through 2018. This paper summarizes the hardware and performance of the Evryscope, including the lessons learned during telescope design, electronics design, a procedure for the precision polar alignment of mounts for Evryscope-like systems, robotic control and operations, and safety and performance-optimization systems. We measure the on-sky performance of the Evryscope, discuss its data analysis pipelines, and present some example variable star and eclipsing binary discoveries from the telescope. We also discuss new discoveries of very rare objects including two hot subdwarf eclipsing binaries with late M-dwarf secondaries (HW Vir systems), two white dwarf/hot subdwarf short-period binaries, and four hot subdwarf reflection binaries. We conclude with the status of our transit surveys, M-dwarf flare survey, and transient detection.

Abstract Copyright: © 2019. The Astronomical Society of the Pacific. All rights reserved.

Journal keyword(s):

VizieR on-line data: <Available at CDS (J/PASP/131/g5001): table4.dat table6.dat>

Nomenclature: Tables 4-6: EVR JHHMMSS.ss+DDMMSS.s N=45+1+14.

Simbad objects: 61

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Number of rows : 61
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 EVR J013131.44+061855.1 V* 01 31 31.4648812104 +06 18 55.505224152   13.960 12.988 12.792   ~ 1 0
2 EVR J024227.96+062556.3 V* 02 42 28.0371675576 +06 25 56.691453180   14.10 13.01     ~ 2 0
3 EVR J031204.99+073711.3 V* 03 12 04.9972578912 +07 37 11.460032760   14.53 13.40     ~ 1 0
4 BPS CS 31083-0078 V* 03 17 36.1179969552 +08 06 44.371237392   13.70 12.65 12.16   ~ 2 0
5 TYC 70-1273-1 PM* 03 37 41.3689996512 +06 47 52.562249268   11.93 11.32     ~ 1 0
6 EVR J040342.82+051630.0 V* 04 03 42.7785603288 +05 16 31.163708388   13.56 12.50     ~ 1 0
7 EVR J054324.82+070043.6 EB* 05 43 25.9600655112 +07 00 24.722039052   15.49 14.42     ~ 1 0
8 EVR J055815.07+082912.5 V* 05 58 14.5645668432 +08 29 13.026380460   14.79 13.65     ~ 1 0
9 2MASS J06225943+0509095 HB* 06 22 59.4386922048 +05 09 09.510042996   15.42 14.14     ~ 4 0
10 EVR J062900.94+075330.8 V* 06 29 01.0013294376 +07 53 31.146732024   12.71 11.86     ~ 2 0
11 EVR J063213.30+063835.2 V* 06 32 13.7066409264 +06 38 28.324365288   15.17 14.31     ~ 1 0
12 2MASS J06430445+0807085 dS* 06 43 04.4575625016 +08 07 08.569250148   13.19 11.90 11.40   ~ 2 0
13 EVR J074608.52+064450.3 EB? 07 46 07.9228118664 +06 44 54.756935772   14.77 13.81     ~ 2 0
14 EVR J090345.07+063356.5 V* 09 03 45.0391719384 +06 33 56.814702372   14.12 13.27     ~ 2 0
15 EVR J111947.62+085811.6 EB* 11 19 47.6334568608 +08 58 11.609568732   14.99 14.02     ~ 1 0
16 EVR J133939.43+080936.4 V* 13 39 39.3917821560 +08 09 36.038805048   13.87 13.00     ~ 2 0
17 EVR J135123.76+074111.4 PM* 13 51 23.7951080328 +07 41 11.064603408   13.40 12.47     ~ 1 0
18 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1136 0
19 EVR J150518.17+062323.6 V* 15 05 18.1358028264 +06 23 23.434641672   14.32 13.36     ~ 1 0
20 TYC 362-421-1 PM* 15 32 40.9050002688 +05 43 37.002284112   12.16 11.68     ~ 2 0
21 EVR J153936.96+061720.8 V* 15 39 36.9070493784 +06 17 20.466044376   13.61 12.61     ~ 1 0
22 EVR J155120.62+061448.8 V* 15 51 20.5871941272 +06 14 48.159553668   14.78 13.56     ~ 1 0
23 EVR J155543.75+062518.8 PM* 15 55 43.6790347752 +06 25 22.662245244   12.28 11.24     ~ 1 0
24 EVR J164449.03+082109.7 V* 16 44 48.9552076792 +08 21 09.219339477   14.34 13.36     ~ 1 0
25 EVR J171609.43+070050.0 EB* 17 16 09.4392962184 +07 00 50.830991136   13.68 12.75     ~ 1 0
26 EVR J173918.65+081931.4 V* 17 39 19.3117078848 +08 19 29.298139536   14.27 13.32     ~ 1 0
27 EVR J175437.66+061028.2 V* 17 54 38.2533796704 +06 10 31.117813176   14.96 14.08     ~ 1 0
28 EVR J180755.37+063452.0 EB* 18 07 55.2217328832 +06 34 42.186753444   15.32 14.12     ~ 1 0
29 EVR J180850.26+073350.4 EB? 18 08 49.9394860368 +07 33 49.752057636   14.57 13.48     ~ 2 0
30 EVR J181019.32+083846.3 EB* 18 10 19.4915914944 +08 38 31.172644464   15.37 14.23     ~ 1 0
31 EVR J181348.53+071553.6 EB* 18 13 48.0281749704 +07 15 42.362676360   14.76 13.87     ~ 1 0
32 EVR J182013.44+083523.6 V* 18 20 13.4897655792 +08 35 25.010640024   13.51 12.23     ~ 1 0
33 EVR J182020.76+065445.0 V* 18 20 20.8618662024 +06 54 48.942821592   14.35 13.25     ~ 1 0
34 EVR J182614.59+053454.1 EB* 18 26 14.8428316296 +05 34 52.883165460   14.36 13.21     ~ 1 0
35 EVR J183036.48+073707.7 EB? 18 30 36.3897871032 +07 37 02.971029468   14.05 13.19     ~ 2 0
36 EVR J184426.98+073442.2 V* 18 44 27.7499550192 +07 34 42.850094340   14.31 13.44     ~ 1 0
37 TYC 474-313-1 V* 19 03 25.4917214424 +07 15 16.531632000   12.10 11.66     ~ 1 0
38 ATO J285.9713+05.3036 EB? 19 03 53.1438185304 +05 18 12.556301292   14.37 13.33     ~ 2 0
39 EVR J190517.30+073520.0 V* 19 05 17.3008552848 +07 35 28.640132088   14.92 13.62     ~ 1 0
40 EVR J190632.06+051345.5 V* 19 06 32.0459223888 +05 13 44.941984680   13.83 12.64     ~ 1 0
41 EVR J191341.81+070205.6 V* 19 13 42.0176215728 +07 01 56.920452852   14.41 13.32     ~ 1 0
42 EVR J191419.87+083226.5 EB* 19 14 20.6443246392 +08 32 26.679907932   15.18 14.23     ~ 1 0
43 EVR J191731.06+070124.6 V* 19 17 31.0395557400 +07 01 25.185913068   13.49 12.46     ~ 1 0
44 EVR J191757.24+090428.2 V* 19 17 57.2363487552 +09 04 35.572852596   15.17 14.30     ~ 1 0
45 EVR J191908.38+083523.6 V* 19 19 08.1281163144 +08 35 28.731434856   15.32 14.37     ~ 1 0
46 EVR J192207.27+084849.7 EB* 19 22 07.2514228200 +08 48 58.424210136   15.13 14.15     ~ 1 0
47 EVR J193728.03+054802.2 V* 19 37 28.2424731216 +05 48 01.861386408   13.95 13.09     ~ 1 0
48 EVR J194419.61+072333.4 EB* 19 44 18.4780884528 +07 23 22.105328784     14.09     ~ 1 0
49 EVR J194947.38+060847.8 V* 19 49 47.7428623728 +06 08 54.940076016   13.80 12.92     ~ 1 0
50 EVR J195419.58+084303.0 V* 19 54 18.8659322736 +08 43 06.870631008   14.89 13.75     ~ 1 0
51 EVR J195728.85+074311.6 V* 19 57 28.7174032824 +07 43 10.816585032   15.28 14.01     ~ 1 0
52 EVR J201131.20+061020.6 EB* 20 11 31.3480176768 +06 10 22.114797096   15.08 14.01     ~ 1 0
53 EVR J201329.93+050717.0 EB* 20 13 29.9345881320 +05 07 17.306435100   12.69 11.81     ~ 1 0
54 EVR J201533.41+082530.4 PM* 20 15 33.4526924736 +08 25 32.039233536   13.58 12.64     ~ 1 0
55 EVR J202807.01+053621.2 EB* 20 28 07.0102788192 +05 36 23.523242292   15.41 14.29     ~ 1 0
56 EVR J203320.59+090539.8 EB? 20 33 20.6427697344 +09 05 40.429136724   14.91 14.00     ~ 2 0
57 EVR J204952.97+054416.1 V* 20 49 52.9031957640 +05 44 16.837700208   13.88 12.97     ~ 2 0
58 EVR J210125.78+082428.8 V* 21 01 25.2093106344 +08 24 27.277854300     14.10     ~ 1 0
59 EVR J211939.26+065648.5 V* 21 19 39.3263099160 +06 56 42.080207496   13.99 12.90     ~ 1 0
60 EVR J230853.71+071107.1 V* 23 08 53.6896024776 +07 11 07.600671672   14.23 13.14     ~ 1 0
61 NAME SCP reg ~ ~           ~ 84 0

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2022.07.01-05:57:13

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