Plasma broadening and shifting of non-hydrogenic spectral lines: present status and applications

https://arxiv.org/pdf/astro-ph/0404432.pdf

Neutrino opacities in nuclear matter

We conducted a Doppler survey at Keck combined with NIRC2 K-band adaptive optics (AO) imaging to search for massive, long-period companions to 123 known exoplanet systems with one or two planets detected using the radial velocity (RV) method. Our survey is sensitive to Jupiter-mass planets out to 20 au for a majority of stars in our sample, and we report the discovery of eight new long-period planets, in addition to 20 systems with statistically significant RV trends that indicate the presence of an outer companion beyond 5 au. We combine our RV observations with AO imaging to determine the range of allowed masses and orbital separations for these companions, and account for variations in our sensitivity to companions among stars in our sample. We estimate the total occurrence rate of companions in our sample to be 52 ± 5% over the range 1–20 M_(Jup) and 5–20 au. Our data also suggest a declining frequency for gas giant planets in these systems beyond 3–10 au, in contrast to earlier studies that found a rising frequency for giant planets in the range 0.01–3 au. This suggests either that the frequency of gas giant planets peaks between 3 and 10 au, or that outer companions in these systems have a different semi-major axis distribution than the overall population of gas giant planets. Our results also suggest that hot gas giants may be more likely to have an outer companion than cold gas giants. We find that planets with an outer companion have higher average eccentricities than their single counterparts, suggesting that dynamical interactions between planets may play an important role in these systems.

/pdf/statistics-of-long-period-gas-giant-planets-in-known-17asnrtyp1.pdf

Statistics of long period gas giant planets in known planetary systems

Experimental Stark widths and shifts for spectral lines of neutral and ionized atoms A critical review of selected data for the period 2001–2007 ☆

/pdf/evaluation-of-self-absorption-of-manganese-emission-lines-in-2ze7ruol60.pdf

Evaluation of self-absorption of manganese emission lines in Laser Induced Breakdown Spectroscopy measurements

Stark widths and shifts of Ne II spectral lines.

Stark-broadening regularities of prominent multiply-ionized-oxygen spectral lines in plasma.

Stark widths and shifts of nine O II lines were measured at electron temperature 54 000 K and electron density 2.8 × 1023m−3 in a linear, low-pressure, pulsed arc operated in a nitrogen-oxygen mixture. Our data are compared with values calculated on the basis of semiclassical approximation.

Measured stark widths and shifts of singly ionized oxygen spectral lines in lower multiplets

The Stark width and shift of six Zn ii and six Cd ii spectral lines have been measured for the electron-density range of 1.0\ifmmode\times\else\texttimes\fi{}${10}^{23--}$1.23\ifmmode\times\else\texttimes\fi{}${10}^{23}$ ${\mathrm{m}}^{\mathrm{\ensuremath{-}}3}$ and for an electron-temperature range of 23 000--33 000 K in a pulsed linear arc plasma discharge in ${\mathrm{SF}}_{6}$ and argon-helium mixture. Obtained Stark-width data were compared with the values calculated on the basis of various theoretical approaches.

Stark broadening and shift of singly ionized zinc and cadmium spectral lines.

Stark broadening and regularities of prominent multiply ionized nitrogen spectral lines.

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