J/AJ/166/193 TESS candidate exoplanet hosts observed with LOFAR (Johnson+, 2023)
A Simultaneous Dual-site Technosignature Search Using International LOFAR
Stations.
Johnson O.A., Gajjar V., Keane E.F., McKenna D.J., Giese C., McKeon B.,
Carozzi T.D., Alcaria C., Brennan A., Brzycki B., Croft S., Drew J.,
Elkins R., Gallagher P.T., Kelly R., Lebofsky M., MacMahon D.H.E.,
McCauley J., de Pater I., Raeside S.R., Siemion A.P.V., Worden S.P.
<Astron. J., 166, 193 (2023)>
=2023AJ....166..193J 2023AJ....166..193J
ADC_Keywords: Exoplanets; Radio sources; Stars, radio
Keywords: Astrobiology ; Search for extraterrestrial intelligence ;
Exoplanets ; Technosignatures ; Radio astronomy
Abstract:
The Search for Extraterrestrial Intelligence aims to find evidence of
technosignatures, which can point toward the possible existence of
technologically advanced extraterrestrial life. Radio signals similar
to those engineered on Earth may be transmitted by other
civilizations, motivating technosignature searches across the entire
radio spectrum. In this endeavor, the low-frequency radio band has
remained largely unexplored; with prior radio searches primarily above
1GHz. In this survey at 110-190MHz, observations of 1631198 targets
from TESS and Gaia are reported. Observations took place
simultaneously with two international stations (noninterferometric) of
the Low Frequency Array in Ireland and Sweden. We can reject the
presence of any Doppler drifting narrowband transmissions in the
barycentric frame of reference, with equivalent isotropic radiated
power of 1017W, for 0.4million (or 1.3million) stellar systems at 110
(or 190)MHz. This work demonstrates the effectiveness of using
multisite simultaneous observations for rejecting anthropogenic
signals in the search for technosignatures.
Description:
This study encompasses a total of 44 targeted pointings, where each
pointing consists of a 15minute scan centered on specific targets
selected from the TESS catalog, focusing on confirmed or candidate
exoplanets (refer to Figure 1). The entire observation campaign
spanned a duration of 11 hr, covering an area of 232deg2 in the
northern sky.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 85 44 TESS candidates used as bore sight pointings
for survey
table4.dat 132 1631152 Gaia candidates found within 1.295deg of TESS
bore sight pointing
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See also:
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
J/ApJ/767/94 : 1.1-1.9GHz SETI survey of KOIs. I. (Siemion+, 2013)
J/A+A/616/A10 : 46 open clusters GaiaDR2 HR diags (Gaia Collaboration, 2018)
J/MNRAS/498/5720 : Extended Breakthrough Listensample (Wlodarczyk-Sroka+, 2020)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- TIC TIC bore sight Identifier (1)
14- 20 F7.2 K Teff [2990/9503]? Effective temperature
22- 29 F8.4 K e_Teff [16/297]? Uncertainty in Teff
31- 43 F13.9 deg RAdeg [5/355] Right Ascensionours (J2000)
45- 55 F11.8 deg DEdeg [41/83] Declination (J2000)
57- 64 F8.4 pc Dist [18.2/743] Distance, Gaia DR2
66- 73 F8.5 pc e_Dist [0.01/51]? Uncertainty in Dist
75- 77 I3 --- I-LOFAR [127/728] I-LOFAR Hits
79- 81 I3 --- LOFAR-SE [177/428] LOFAR-SE Hits
83- 83 I1 --- Mutual [0] Mutual Hits
85- 85 A1 --- f_TIC Exoplanet flag (2)
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Note (1): These targets were obtained from the NASA Exoplanet Archive
(NEA) Targets of Interest database. Selection criteria was based
on what targets were visible at both stations.
Note (2): A "*" denotes a confirmed exoplanet in the NEA.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 28 A28 --- Gaia Gaia DR3 Source name
30- 49 F20.16 deg RAdeg [2/360] Right Ascension (ICRS at Epoch=2016.0)
51- 68 F18.15 deg DEdeg [40/84] Declination (ICRS at Epoch=2016.0)
70- 79 F10.4 pc Dist [10.8/18359] Distance, Gaia DR3 GSP-Phot distance
81- 90 F10.4 K Teff [2719/41219] Surface effective temperature,
Gaia DR3
92-112 F21.19 deg Sep [0.0007/1.29] Pointing separation, degrees
114-122 I9 --- TIC TESS Input Catalog bore sight identifier (Table3)
124-126 I3 --- I-LOFAR [127/728] I-LOFAR Hits
128-130 I3 --- LOFAR-SE [177/428] LOFAR-SE Hits
132-132 I1 --- Mutual [0/0] Mutual Hits
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 09-Apr-2024